<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    <p>Hi All,</p>
    <p><br>
    </p>
    <p>I have followed this discussion with interest and would like to
      say I agree with all the replies of being cautious about adding
      more file formats to be officially supported by Nexus. It would be
      a classic case of throwing the baby out with the bathwater! In
      this case HDF5 is the baby and the bathwater is the infrastructure
      (file system, network, etc.). Nexus/HDF5 can be seen as the
      reference implementation which is the official (i.e. validated)
      implementation of Nexus. Other implementations (e.g. based on zarr
      etc.) are alternatives which could be shared as contributions
      derived from the reference implementation.<br>
    </p>
    <p><br>
    </p>
    <p>Gabriel, I understand the need to have very high performance or
      different file formats but these should be supported locally and
      mapped to Nexus definitions if necessary as a local exercise. For
      example we have done this at the ESRF for the ICAT database
      mapping Nexus definitions to ICAT parameters. We also support
      other file formats when we have to e.g. jpeg2000. The community is
      there to share such developments. I would not however burden the
      Nexus committee with  having to officially support other file
      formats and I would definitely not develop our own API which is
      challenging in its own right but also a long term maintenance
      issue. The current version of Nexus relies strongly on HDF5 so
      moving to another format would be difficult, it would also create
      confusion for users who are in the process of moving to Nexus/HDF5
      if we say to them now to adopt another file format - it is
      challenging enough to change their codes to read Nexus/HDF5. Most
      of our problems can still be solved with HDF5 so the best is to
      ask others how they solved the same problem to see if they have
      been solved already.</p>
    <p><br>
    </p>
    <p>I recommend you (and all European HDF5 users) to attend the next
      HDF User Group workshop in Europe
      (<a class="moz-txt-link-freetext" href="https://www.hdfgroup.org/hug/europeanhug22/">https://www.hdfgroup.org/hug/europeanhug22/</a>) which will take
      place not far away from ALBA in the south of France. This is an
      opportunity to discuss with the HDF5 developers and other users on
      your problems and how to solve them.</p>
    <p><br>
    </p>
    <p>Kind regards</p>
    <p><br>
    </p>
    <p>Andy</p>
    <p><br>
    </p>
    <div class="moz-cite-prefix">On 12/04/2022 12:50, Watts Benjamin
      (PSI) via NeXus wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:4f1baeac49544f80afcd105e025e2ecc@psi.ch">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <style type="text/css" style="display:none;">P {margin-top:0;margin-bottom:0;}</style>
      <div id="divtagdefaultwrapper"
style="font-size:12pt;color:#000000;font-family:Calibri,Helvetica,sans-serif;"
        dir="ltr">
        <div id="divtagdefaultwrapper" dir="ltr" style="font-size: 12pt;
          color: rgb(0, 0, 0); font-family: Calibri, Helvetica,
          sans-serif, "EmojiFont", "Apple Color
          Emoji", "Segoe UI Emoji", NotoColorEmoji,
          "Segoe UI Symbol", "Android Emoji",
          EmojiSymbols;">
          <p>Hi Everyone,</p>
          <p>   My understanding is that the core NeXus mission has only
            concerned the organisation of the data. The container file
            format was only within our scope for the practical reasons
            of demonstrating how to implement the NeXus structures. We
            recommended HDF5 because we did not see viable alternatives
            for a long time. <br>
          </p>
          <p><br>
          </p>
          <p>I think that there are both practical and ideological
            aspects to the discussion about file formats for NeXus and
            it is a bit confronting for some of us because we see
            conflict between these aspects. On the one hand, we should
            encourage people using file formats other than HDF5 and XML
            to organise their data using NeXus. On the other hand, we
            don't want to encourage a "wild west" in file formats where
            reading archived files becomes a hunt for obscure libraries.
            On this point - what is the role that NeXus should play?
            Certainly, NeXus should only promote file formats that are
            capable of expressing the NeXus hierarchies. NeXus should
            also document how the data hierarchies are expressed in each
            file format (I think we can do this in a more formal way
            than we currently do). If NeXus is to do any discrimination
            between file formates, I would like for us to come up with a
            set of criteria for file formats to meet in order to gain
            NeXus approval. NeXus does not currently have the resources
            to support further file formats in the NeXus libraries
            (NAPI) and perhaps community support could be one of the
            criteria for approval.<br>
          </p>
          <p><br>
          </p>
          <p>Cheers,</p>
          <p>Ben<br>
          </p>
          <p><br>
          </p>
        </div>
        <hr tabindex="-1" style="display:inline-block; width:98%">
        <div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
            face="Calibri, sans-serif" color="#000000"><b>From:</b>
            Osborn, Raymond <a class="moz-txt-link-rfc2396E" href="mailto:rosborn@anl.gov"><rosborn@anl.gov></a><br>
            <b>Sent:</b> Thursday, 7 April 2022 9:42:50 PM<br>
            <b>To:</b> Discussion forum for the NeXus data format<br>
            <b>Cc:</b> Tobias Richter; <a class="moz-txt-link-abbreviated" href="mailto:nexus@nexusformat.org">nexus@nexusformat.org</a>; Watts
            Benjamin (PSI); Alexander Debus; Nicolas Soler; Franz
            Pöschel; Emilio Centeno Ortiz<br>
            <b>Subject:</b> Re: [Nexus] HDF5 as NeXus file format</font>
          <div> </div>
        </div>
        <div>Hi everyone,
          <div class="">NeXus was originally both a standard for
            defining how data should be organized in files and a unified
            API for reading and writing those files, irrespective of the
            physical file format, HDF4, HDF5, or XML. Thanks mainly to
            the work that Mark Koennecke put into the C-API, it achieved
            both goals seamlessly. I think it was a remarkable technical
            achievement. To some extent, the two components were
            independent of each other, but not entirely. For example,
            HDF4 did not allow group attributes, so for a long time,
            they were not part of the definitions. Now that HDF4 is
            obsolete, the NeXus definitions have evolved to use more and
            more of the features that HDF5 provides, many of which have
            become an essential part of the standard. </div>
          <div class=""><br class="">
          </div>
          <div class="">I think there are therefore two questions that
            need to be clarified, preferably before we next meet. The
            first is whether the proposed alternative physical file
            formats will allow the same type of hierarchical data
            organization and features that have now become part of the
            standard. If they didn’t, this would probably be a
            deal-breaker, unless there is a way of interfacing, say,
            regular HDF5 NeXus files to the new file formats, in much
            the same way that HDF5 handles external links. </div>
          <div class=""><br class="">
          </div>
          <div class="">The second is whether there is a need to revive
            the API to handle the new formats, so that we are not faced
            with the situation that Tobias warned about with a large
            fraction of the user community unable to read such files.
            The reason the API became deprecated is, in my view, that we
            have depended too much on one or two people (i.e., Mark in
            the case of the C-API) to take all the responsibility for
            maintaining it, so that supporting new HDF5 features, such
            as virtual data sets or even variable-length-strings, fell
            entirely on them. While an increasing number of facilities
            have become dependent on NeXus, very few of them, if any,
            have committed resources to maintaining it, so it has become
            an activity that many of us squeeze in when we have free
            time from our other responsibilities. If facilities like
            Alba, and presumably others, feel that they are being held
            back by technical limitations of HDF5, then it might be
            necessary to rethink the NeXus support model, so that API
            development is revived by being integrated into other
            facility software development projects, such as Mantid or
            Dials. It would probably save the facilities money in the
            long term, but it would require NeXus to be less of a
            part-time activity. Or we need to encourage more people to
            contribute, in the way the more successful open-source
            projects are run. I would certainly welcome additional
            support for the Python API for the same reasons.</div>
          <div class=""><br class="">
          </div>
          <div class="">With best regards,</div>
          <div class="">Ray</div>
          <div class="">
            <div class="">
              <div class="">-- <br class="">
                Ray Osborn, Senior Scientist<br class="">
                Materials Science Division<br class="">
                Argonne National Laboratory<br class="">
                Argonne, IL 60439, USA<br class="">
                Phone: +1 (630) 252-9011<br class="">
                <a href="mailto:ROsborn@anl.gov" class=""
                  moz-do-not-send="true">Email: ROsborn@anl.gov</a><br
                  class="">
                <br class="">
              </div>
              <div><br class="">
                <blockquote type="cite" class="">
                  <div class="">On Apr 7, 2022, at 12:16 PM, Watts
                    Benjamin (PSI) via NeXus <<a
                      href="mailto:nexus@shadow.nd.rl.ac.uk"
                      class="moz-txt-link-freetext"
                      moz-do-not-send="true">nexus@shadow.nd.rl.ac.uk</a>>
                    wrote:</div>
                  <br class="Apple-interchange-newline">
                  <div class="">
                    <div id="divtagdefaultwrapper" dir="ltr" class=""
                      style="font-style: normal; font-weight: normal;
                      letter-spacing: normal; text-align: start;
                      text-indent: 0px; text-transform: none;
                      white-space: normal; word-spacing: 0px;
                      text-decoration: none; font-size: 12pt;
                      font-family: Calibri, Helvetica, sans-serif,
                      "EmojiFont", "Apple Color
                      Emoji", "Segoe UI Emoji",
                      NotoColorEmoji, "Segoe UI Symbol",
                      "Android Emoji", EmojiSymbols;">
                      <div class="" style="margin-top:0px;
                        margin-bottom:0px">Hi Tobias,</div>
                      <div class="" style="margin-top:0px;
                        margin-bottom:0px">   I agree that we have spent
                        the past decade recommending HDF5, but at the
                        same time we have been saying that NeXus is
                        about the organisation of data within the
                        container, not the container file format itself.
                        I can see that you feel surprised by the sudden
                        discussion of other file formats, just as I was
                        surprised to hear the community talking about it
                        at the recent NFDI workshop. I am only
                        advocating for discussion and I would like to
                        hear your input.<span
                          class="Apple-converted-space"> </span><span
                          class="">I agree that multiple backends will
                          introduce higher support requirements that
                          NeXus doesn't currently have resources for.</span><span
                          class="Apple-converted-space"> </span>Your
                        preference for NeXus referring to a (small)
                        defined set of file formats is a valid view
                        point and I agree that there are practicalities
                        to consider. I view the next telco as just the
                        restart of an old discussion and nothing can
                        really change until a proposal is brought to a
                        NIAC meeting (and accepted).</div>
                      <div class="" style="margin-top:0px;
                        margin-bottom:0px"><br class="">
                      </div>
                      <div class="" style="margin-top:0px;
                        margin-bottom:0px">Cheers,</div>
                      <div class="" style="margin-top:0px;
                        margin-bottom:0px">Ben<br class="">
                      </div>
                    </div>
                    <hr tabindex="-1" class=""
                      style="font-family:Helvetica; font-size:12px;
                      font-style:normal; font-weight:normal;
                      letter-spacing:normal; text-align:start;
                      text-indent:0px; text-transform:none;
                      white-space:normal; word-spacing:0px;
                      text-decoration:none; display:inline-block;
                      width:1835.53125px">
                    <span class="" style="font-family:Helvetica;
                      font-size:12px; font-style:normal;
                      font-weight:normal; letter-spacing:normal;
                      text-align:start; text-indent:0px;
                      text-transform:none; white-space:normal;
                      word-spacing:0px; text-decoration:none;
                      float:none; display:inline!important"></span>
                    <div id="divRplyFwdMsg" dir="ltr" class=""
                      style="font-family:Helvetica; font-size:12px;
                      font-style:normal; font-weight:normal;
                      letter-spacing:normal; text-align:start;
                      text-indent:0px; text-transform:none;
                      white-space:normal; word-spacing:0px;
                      text-decoration:none">
                      <font class="" style="font-size:11pt"
                        face="Calibri, sans-serif"><b class="">From:</b><span
                          class="Apple-converted-space"> </span>Tobias
                        Richter <<a
                          href="mailto:Tobias.Richter@ess.eu"
                          class="moz-txt-link-freetext"
                          moz-do-not-send="true">Tobias.Richter@ess.eu</a>><br
                          class="">
                        <b class="">Sent:</b><span
                          class="Apple-converted-space"> </span>Thursday,
                        7 April 2022 6:23:43 PM<br class="">
                        <b class="">To:</b><span
                          class="Apple-converted-space"> </span>Discussion
                        forum for the NeXus data format;
                        <a href="mailto:nexus@nexusformat.org"
                          class="moz-txt-link-freetext"
                          moz-do-not-send="true">nexus@nexusformat.org</a><br
                          class="">
                        <b class="">Cc:</b><span
                          class="Apple-converted-space"> </span>Watts
                        Benjamin (PSI); Alexander Debus; Nicolas Soler;
                        Franz Pöschel; Emilio Centeno Ortiz<br class="">
                        <b class="">Subject:</b><span
                          class="Apple-converted-space"> </span>Re:
                        [Nexus] HDF5 as NeXus file format</font>
                      <div class=""> </div>
                    </div>
                    <div class="" style="font-family:Helvetica;
                      font-size:12px; font-style:normal;
                      font-weight:normal; letter-spacing:normal;
                      text-align:start; text-indent:0px;
                      text-transform:none; white-space:normal;
                      word-spacing:0px; text-decoration:none">
                      <div class="WordSection1" style="">
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class="">Hi all,</span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class=""> </span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class="">According to this discussion
                            from a decade ago HDF5 is singled out as the
                            only preferred physical file format:<span
                              class="Apple-converted-space"> </span><a
                              href="https://www.nexusformat.org/NIAC2012"
                              class="moz-txt-link-freetext"
                              style="color:blue;
                              text-decoration:underline"
                              moz-do-not-send="true">https://www.nexusformat.org/NIAC2012</a></span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class=""> </span></div>
                        <ul class="" style="margin-bottom:0cm"
                          type="disc">
                          <li class="MsoNormal" style="margin:0cm;
                            font-size:11pt;
                            font-family:Calibri,sans-serif;
                            color:rgb(81,81,81); background-color:white">
                            <span class="" style="font-size:13.5pt;
                              font-family:"PT
                              Sans",sans-serif">NeXus guiding
                              statements:</span>
                            <ul class="" style="margin-bottom:0cm"
                              type="circle">
                              <li class="MsoNormal" style="margin:0cm;
                                font-size:11pt;
                                font-family:Calibri,sans-serif;
                                color:rgb(81,81,81);
                                background-color:white">
                                <span class="" style="font-size:13.5pt;
                                  font-family:"PT
                                  Sans",sans-serif">The main focus
                                  of the NeXus community is to further
                                  develop the dictionaries, base classes
                                  and application definitions.</span></li>
                              <li class="MsoNormal" style="margin:0cm;
                                font-size:11pt;
                                font-family:Calibri,sans-serif;
                                color:rgb(81,81,81);
                                background-color:white">
                                <span class="" style="font-size:13.5pt;
                                  font-family:"PT
                                  Sans",sans-serif">The NIAC is a
                                  forum for resolving issues.</span></li>
                              <li class="MsoNormal" style="margin:0cm;
                                font-size:11pt;
                                font-family:Calibri,sans-serif;
                                color:rgb(81,81,81);
                                background-color:white">
                                <span class="" style="font-size:13.5pt;
                                  font-family:"PT
                                  Sans",sans-serif">The NIAC acts
                                  as a custodian for NeXus: definitions,
                                  examples, documentation, reference
                                  implementations.</span></li>
                              <li class="MsoNormal" style="margin:0cm;
                                font-size:11pt;
                                font-family:Calibri,sans-serif;
                                color:rgb(81,81,81);
                                background-color:white">
                                <span class="" style="font-size:13.5pt;
                                  font-family:"PT
                                  Sans",sans-serif">NeXus can be
                                  mapped to different physical file
                                  formats:</span>
                                <ul class="" style="margin-bottom:0cm"
                                  type="square">
                                  <li class="MsoNormal"
                                    style="margin:0cm; font-size:11pt;
                                    font-family:Calibri,sans-serif;
                                    color:rgb(81,81,81);
                                    background-color:white">
                                    <span class=""
                                      style="font-size:13.5pt;
                                      font-family:"PT
                                      Sans",sans-serif">HDF5 is the
                                      preferred physical file format.</span></li>
                                  <li class="MsoNormal"
                                    style="margin:0cm; font-size:11pt;
                                    font-family:Calibri,sans-serif;
                                    color:rgb(81,81,81);
                                    background-color:white">
                                    <span class=""
                                      style="font-size:13.5pt;
                                      font-family:"PT
                                      Sans",sans-serif">NeXus-XML
                                      is the currently supported ASCII
                                      file format.</span></li>
                                </ul>
                              </li>
                            </ul>
                          </li>
                        </ul>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class=""> </span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class="">Technically you can map into
                            different backends. Yes. XML is still sort
                            of supported. At the time it was requested
                            that other options would get the official
                            blessing (YAML being specifically asked for)
                            but for practical exchange between
                            facilities the consensus was to stick with
                            HDF5.</span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class=""> </span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class="">There no longer is a
                            recommended or fully maintained abstraction
                            layer (like NAPI) to do an on the fly
                            translation between backends. Who would be
                            in charge of defining how the “official”
                            mapping into sqlite or whatever would look
                            like? How many backends can the community
                            commit to support in the long run?</span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class=""> </span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class="">When tools that are currently
                            developed/supported/maintained to “read”
                            NeXus/HDF5 fail to work with what gets
                            handed out, we are in a worse situation than
                            we are now. Note: What facilities do
                            internally for performance optimisations or
                            other reasons could be different, if it
                            stays internal. But I am clearly a lot less
                            open minded about producing non-HDF5 files
                            with a “NeXus” label than Ben. Maybe I
                            missed some decisions that were taken lately
                            in this direction or we’re no longer
                            interested in being able to read each
                            other’s files. Should either be the case,
                            I’ll be quiet.</span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class=""> </span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class="">Best wishes,</span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class="">Tobias</span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class=""> </span></div>
                        <div class="" style="margin:0cm; font-size:11pt;
                          font-family:Calibri,sans-serif">
                          <span class=""> </span></div>
                        <div class="" style="border-style:solid none
                          none; border-top-width:1pt;
                          border-top-color:rgb(181,196,223); padding:3pt
                          0cm 0cm">
                          <div class="" style="margin:0cm 0cm 0cm 36pt;
                            font-size:11pt;
                            font-family:Calibri,sans-serif">
                            <b class=""><span class=""
                                style="font-size:12pt">From:<span
                                  class="Apple-converted-space"> </span></span></b><span
                              class="" style="font-size:12pt">NeXus <<a
href="mailto:nexus-bounces@shadow.nd.rl.ac.uk"
                                class="moz-txt-link-freetext"
                                moz-do-not-send="true">nexus-bounces@shadow.nd.rl.ac.uk</a>>
                              on behalf of "Watts Benjamin (PSI) via
                              NeXus" <<a
                                href="mailto:nexus@shadow.nd.rl.ac.uk"
                                class="moz-txt-link-freetext"
                                moz-do-not-send="true">nexus@shadow.nd.rl.ac.uk</a>><br
                                class="">
                              <b class="">Reply to:<span
                                  class="Apple-converted-space"> </span></b>Discussion
                              forum for the NeXus data format <<a
                                href="mailto:nexus@shadow.nd.rl.ac.uk"
                                class="moz-txt-link-freetext"
                                moz-do-not-send="true">nexus@shadow.nd.rl.ac.uk</a>><br
                                class="">
                              <b class="">Date:<span
                                  class="Apple-converted-space"> </span></b>Thursday,
                              7 April 2022 at 17:10<br class="">
                              <b class="">To:<span
                                  class="Apple-converted-space"> </span></b>"<a
                                href="mailto:nexus@nexusformat.org"
                                class="moz-txt-link-freetext"
                                moz-do-not-send="true">nexus@nexusformat.org</a>"
                              <<a href="mailto:nexus@nexusformat.org"
                                class="moz-txt-link-freetext"
                                moz-do-not-send="true">nexus@nexusformat.org</a>><br
                                class="">
                              <b class="">Cc:<span
                                  class="Apple-converted-space"> </span></b>Benjamin
                              Watts <<a
                                href="mailto:benjamin.watts@psi.ch"
                                class="moz-txt-link-freetext"
                                moz-do-not-send="true">benjamin.watts@psi.ch</a>>,
                              Alexander Debus <<a
                                href="mailto:a.debus@hzdr.de"
                                class="moz-txt-link-freetext"
                                moz-do-not-send="true">a.debus@hzdr.de</a>>,
                              Nicolas Soler <<a
                                href="mailto:nsoler@cells.es"
                                class="moz-txt-link-freetext"
                                moz-do-not-send="true">nsoler@cells.es</a>>,
                              Franz Pöschel <<a
                                href="mailto:f.poeschel@hzdr.de"
                                class="moz-txt-link-freetext"
                                moz-do-not-send="true">f.poeschel@hzdr.de</a>>,
                              Emilio Centeno Ortiz <<a
                                href="mailto:ecenteno@cells.es"
                                class="moz-txt-link-freetext"
                                moz-do-not-send="true">ecenteno@cells.es</a>><br
                                class="">
                              <b class="">Subject:<span
                                  class="Apple-converted-space"> </span></b>Re:
                              [Nexus] HDF5 as NeXus file format</span></div>
                        </div>
                        <div class="">
                          <div class="" style="margin:0cm 0cm 0cm 36pt;
                            font-size:11pt;
                            font-family:Calibri,sans-serif">
                             </div>
                        </div>
                        <div id="divtagdefaultwrapper" class=""
                          style="font-family: Helvetica,
                          "EmojiFont", "Apple Color
                          Emoji", "Segoe UI Emoji",
                          NotoColorEmoji, "Segoe UI Symbol",
                          "Android Emoji", EmojiSymbols;">
                          <div class="" style="margin-top:0px;
                            margin-bottom:0px; margin-left:36pt"><span
                              class="" style="font-size:12pt">Hi
                              Gabriel,</span></div>
                          <div class="" style="margin-top:0px;
                            margin-bottom:0px; margin-left:36pt"><span
                              class="" style="font-size:12pt">   NeXus
                              is officially not dependent on HDF5 and we
                              are definitely open minded about
                              implementing the NeXus<span
                                class="Apple-converted-space"> </span><i
                                class="">data format</i><span
                                class="Apple-converted-space"> </span>on<span
                                class="Apple-converted-space"> </span><i
                                class="">file formats</i><span
                                class="Apple-converted-space"> </span>other
                              than HDF5. We plan to discuss such issues
                              at our<span class="Apple-converted-space"> </span><a
href="https://www.nexusformat.org/Telco_20220426.html" class=""
                                style="color:blue;
                                text-decoration:underline"
                                moz-do-not-send="true">next
                                teleconference</a><span
                                class="Apple-converted-space"> </span>on
                              April 26th and I invite you to join us.
                              Are there specific container file formats
                              that you are interested in?</span></div>
                          <div class="" style="margin-top:0px;
                            margin-bottom:0px; margin-left:36pt"><span
                              class="" style="font-size:12pt"> </span></div>
                          <div class="" style="margin-top:0px;
                            margin-bottom:0px; margin-left:36pt"><span
                              class="" style="font-size:12pt">Cheers,</span></div>
                          <div class="" style="margin-top:0px;
                            margin-bottom:0px; margin-left:36pt"><span
                              class="" style="font-size:12pt">Ben</span></div>
                          <p class="MsoNormal" style="margin:0cm 0cm
                            12pt 36pt; font-size:11pt;
                            font-family:Calibri,sans-serif">
                            <span class="" style="font-size:12pt"> </span></p>
                          <div class="">
                            <div class="MsoNormal" style="margin:0cm 0cm
                              0cm 36pt; font-size:11pt;
                              font-family:Calibri,sans-serif;
                              text-align:center" align="center">
                              <span class="" style="font-size:12pt">
                                <hr class="" width="100%" size="0"
                                  align="center">
                              </span></div>
                            <div id="divRplyFwdMsg" class="">
                              <div class="" style="margin:0cm 0cm 0cm
                                36pt; font-size:11pt;
                                font-family:Calibri,sans-serif">
                                <b class=""><span class="" style="">From:</span></b><span
                                  class="" style=""><span
                                    class="Apple-converted-space"> </span>NeXus
                                  <<a
                                    href="mailto:nexus-bounces@shadow.nd.rl.ac.uk"
                                    class="moz-txt-link-freetext"
                                    moz-do-not-send="true">nexus-bounces@shadow.nd.rl.ac.uk</a>>
                                  on behalf of Gabriel Jover Manas via
                                  NeXus <<a
                                    href="mailto:nexus@shadow.nd.rl.ac.uk"
                                    class="moz-txt-link-freetext"
                                    moz-do-not-send="true">nexus@shadow.nd.rl.ac.uk</a>><br
                                    class="">
                                  <b class="">Sent:</b><span
                                    class="Apple-converted-space"> </span>Thursday,
                                  7 April 2022 4:47 PM<br class="">
                                  <b class="">To:</b><span
                                    class="Apple-converted-space"> </span><a
                                    href="mailto:nexus@nexusformat.org"
                                    class="moz-txt-link-freetext"
                                    moz-do-not-send="true">nexus@nexusformat.org</a><br
                                    class="">
                                  <b class="">Cc:</b><span
                                    class="Apple-converted-space"> </span>Gabriel
                                  Jover Manas; Nicolas Soler; Emilio
                                  Centeno Ortiz<br class="">
                                  <b class="">Subject:</b><span
                                    class="Apple-converted-space"> </span>[Nexus]
                                  HDF5 as NeXus file format</span><span
                                  class="" style="font-size:12pt"></span></div>
                              <div class="">
                                <div class="" style="margin:0cm 0cm 0cm
                                  36pt; font-size:11pt;
                                  font-family:Calibri,sans-serif">
                                  <span class="" style="font-size:12pt"> </span></div>
                              </div>
                            </div>
                            <div class="">
                              <div class="" style="margin:0cm 0cm 0cm
                                36pt; font-size:11pt;
                                font-family:Calibri,sans-serif">
                                <span class="" style="font-size:12pt">Dear
                                  NeXus Users Community,</span></div>
                              <div class="" style="margin-top:0px;
                                margin-bottom:0px; margin-left:36pt"><span
                                  class="" style="font-size:12pt">Last
                                  NFDI NeXus Workshop was a great
                                  opportunity to meet the community and
                                  learn from the experience of other
                                  scientists and institutions.</span></div>
                              <div class="" style="margin-top:0px;
                                margin-bottom:0px; margin-left:36pt"><span
                                  class="" style="font-size:12pt">Here
                                  at ALBA we are working on the
                                  integration of NeXus files in our data
                                  analysis workflows.</span></div>
                              <div class="" style="margin-top:0px;
                                margin-bottom:0px; margin-left:36pt"><span
                                  class="" style="font-size:12pt">In
                                  this scope we are interested on
                                  investigating alternatives to hdf5 as
                                  NeXus file format, in terms of slice
                                  read/write performance,
                                  read-write-many capabilities and
                                  convenient reading.</span></div>
                              <div class="" style="margin-top:0px;
                                margin-bottom:0px; margin-left:36pt"><span
                                  class="" style="font-size:12pt">Would
                                  the community be open to decoupling
                                  the data format (NeXus) from the file
                                  format (HDF5)?<br class="">
                                  Is there already any effort in the
                                  community in this direction?<br
                                    class="">
                                  Is anyone else also interested?</span></div>
                              <div class="" style="margin-top:0px;
                                margin-bottom:0px; margin-left:36pt"><span
                                  class="" style="font-size:12pt"> </span></div>
                              <div class="" style="margin-top:0px;
                                margin-bottom:0px; margin-left:36pt"><span
                                  class="" style="font-size:12pt">Best
                                  regards,</span></div>
                              <div class="" style="margin-top:0px;
                                margin-bottom:0px; margin-left:36pt"><span
                                  class="" style="font-size:12pt">Gabriel</span></div>
                              <div class="" style="margin-top:0px;
                                margin-bottom:0px; margin-left:36pt"><span
                                  class="" style="font-size:12pt"> </span></div>
                              <div class="">
                                <div class="" style="margin:0cm 0cm 0cm
                                  36pt; font-size:11pt;
                                  font-family:Calibri,sans-serif">
                                  <span class="" style="font-size:12pt">--</span></div>
                                <div class="">
                                  <div class="">
                                    <table class="MsoNormalTable"
                                      style="width:468pt;
                                      margin-left:36pt" width="624"
                                      cellspacing="0" cellpadding="0"
                                      border="0">
                                      <tbody class="">
                                        <tr class="">
                                          <td rowspan="2" class=""
                                            style="width:94.9pt;
                                            padding:0cm" width="127">
                                            <div class=""
                                              style="margin-top:0px;
                                              margin-bottom:0px"><a
                                                href="http://www.albasynchrotron.es/"
                                                target="_blank" class=""
                                                style="color:blue;
                                                text-decoration:underline"
                                                moz-do-not-send="true"><span
                                                  class=""
                                                  style="color:windowtext;
                                                  text-decoration:none"><span
                                                    class=""
                                                    style="color:blue;
                                                    border:1pt solid
                                                    windowtext;
                                                    padding:0cm"><img
                                                      id="_x0000_i1025"
                                                      alt="Image removed
                                                      by sender. ALBA
                                                      Synchrotron"
                                                      class=""
                                                      style="width:1.2291in;
                                                      height:0.5729in"
                                                      src="cid:~WRD0000.jpg"
moz-do-not-send="true" width="118" height="55" border="0"></span></span></a></div>
                                          </td>
                                          <td class=""
                                            style="width:373.1pt;
                                            padding:3.75pt 0cm 0cm"
                                            width="497" valign="top">
                                            <div class=""
                                              style="margin:0cm;
                                              font-size:11pt;
                                              font-family:Calibri,sans-serif">
                                              <b class=""><span class=""
                                                  style="font-size:12pt;
font-family:Arial,sans-serif; color:rgb(17,46,80)">Gabriel Jover-Mañas</span></b></div>
                                          </td>
                                        </tr>
                                        <tr class="">
                                          <td class=""
                                            style="width:373.1pt;
                                            padding:3.75pt 0cm 0cm"
                                            width="497" valign="top">
                                            <div class=""
                                              style="margin:0cm;
                                              font-size:11pt;
                                              font-family:Calibri,sans-serif">
                                              <span class=""
                                                style="font-size:9pt;
                                                font-family:Arial,sans-serif">Scientific
                                                Data Management<br
                                                  class="">
                                                Computing Division<span
class="Apple-converted-space"> </span></span></div>
                                          </td>
                                        </tr>
                                        <tr class="">
                                          <td colspan="2" class=""
                                            style="padding:3.75pt 0cm
                                            0cm" valign="top">
                                            <div class=""
                                              style="margin:0cm;
                                              font-size:11pt;
                                              font-family:Calibri,sans-serif">
                                               </div>
                                          </td>
                                        </tr>
                                        <tr class="">
                                          <td colspan="2" class=""
                                            style="padding:3.75pt 0cm
                                            0cm" valign="top">
                                            <div class=""
                                              style="margin:0cm;
                                              font-size:11pt;
                                              font-family:Calibri,sans-serif">
                                              <b class=""><span class=""
                                                  style="font-size:10pt;
font-family:Arial,sans-serif">ALBA SYNCHROTRON LIGHT SOURCE</span></b></div>
                                          </td>
                                        </tr>
                                        <tr class="">
                                          <td colspan="2" class=""
                                            style="padding:3.75pt 0cm
                                            0cm" valign="top">
                                            <div class=""
                                              style="margin:0cm;
                                              font-size:11pt;
                                              font-family:Calibri,sans-serif">
                                              <span class=""
                                                style="font-size:9pt;
                                                font-family:Arial,sans-serif"><a
href="http://www.albasynchrotron.es/en/about/coming-to-alba"
                                                  target="_blank"
                                                  class=""
                                                  style="color:blue;
                                                  text-decoration:underline"
                                                  moz-do-not-send="true">Carrer
                                                  de la Llum 2-26 |
                                                  08290 | Cerdanyola del
                                                  Vallès| Barcelona |
                                                  Spain<span
                                                    class="Apple-converted-space"> </span></a><br
                                                  class="">
                                                (+34) 93 592 4471<span
                                                  class="Apple-converted-space"> </span></span></div>
                                          </td>
                                        </tr>
                                        <tr class="">
                                          <td colspan="2" class=""
                                            style="padding:3.75pt 0cm
                                            0cm" valign="top">
                                            <div class=""
                                              style="margin:0cm;
                                              font-size:11pt;
                                              font-family:Calibri,sans-serif">
                                              <b class=""><span class=""
                                                  style="font-size:9pt;
                                                  color:rgb(17,46,80)"><a
href="http://www.albasynchrotron.es/" target="_blank" class=""
                                                    style="color:blue;
                                                    text-decoration:underline"
moz-do-not-send="true">www.albasynchrotron.es</a></span></b><b class=""><span
                                                  class=""
                                                  style="font-size:7.5pt;
                                                  color:rgb(17,46,80)"><span
class="Apple-converted-space"> </span>|<span
                                                    class="Apple-converted-space"> </span></span></b><b
                                                class=""><span class=""
                                                  style="font-size:9pt;
                                                  color:rgb(17,46,80)"><a
href="mailto:Gabriel.Jover@cells.es" class="" style="color:blue;
                                                    text-decoration:underline"
moz-do-not-send="true">Gabriel.Jover@cells.es<span
                                                      class="Apple-converted-space"> </span></a>|<span
class="Apple-converted-space"> </span><a
                                                    href="https://www.albasynchrotron.es/en/about/legal-notice"
                                                    target="_blank"
                                                    class=""
                                                    style="color:blue;
                                                    text-decoration:underline"
moz-do-not-send="true">legal notice</a></span></b></div>
                                          </td>
                                        </tr>
                                        <tr class="">
                                          <td colspan="2" class=""
                                            style="padding:3.75pt 0cm
                                            0cm" valign="top">
                                            <div class=""
                                              style="margin:0cm;
                                              font-size:11pt;
                                              font-family:Calibri,sans-serif">
                                               <span
                                                class="Apple-converted-space"> </span></div>
                                          </td>
                                        </tr>
                                        <tr class="">
                                          <td colspan="2" class=""
                                            style="padding:6pt 0cm 0cm"
                                            valign="top">
                                            <div class=""
                                              style="margin:0cm;
                                              font-size:11pt;
                                              font-family:Calibri,sans-serif">
                                              <b class=""><span class=""
                                                  style="font-size:8pt;
color:rgb(138,138,138)">Please, do not print this e-mail unless it is
                                                  absolutely necessary.<span
class="Apple-converted-space"> </span><br class="">
                                                </span></b><span
                                                class=""
                                                style="font-size:8pt;
                                                color:rgb(138,138,138)">Si
                                                heu rebut aquest correu
                                                per error, us informo
                                                que pot contenir
                                                informació confidencial
                                                i privada i que està
                                                prohibit el seu ús. Us
                                                agrairíem que ho
                                                comuniqueu al remitent i
                                                l'elimineu. Gràcies.<br
                                                  class="">
                                                Si ha recibido este
                                                correo por error, le
                                                informo de que puede
                                                contener información
                                                confidencial y privada y
                                                que está prohibido su
                                                uso. Le agradeceré que
                                                lo comunique a su
                                                remitente y lo elimine.
                                                Gracias.<br class="">
                                                If you have received
                                                this e-mail in error,
                                                please note that it may
                                                contain confidential and
                                                private information,
                                                therefore, the use of
                                                this information is
                                                strictly forbidden.
                                                Please inform the sender
                                                of the error and delete
                                                the information
                                                received. Thank you.</span></div>
                                          </td>
                                        </tr>
                                      </tbody>
                                    </table>
                                    <div class="" style="margin:0cm 0cm
                                      0cm 36pt; font-size:11pt;
                                      font-family:Calibri,sans-serif">
                                       </div>
                                  </div>
                                </div>
                              </div>
                            </div>
                          </div>
                        </div>
                      </div>
                    </div>
                    <span class="" style="font-family:Helvetica;
                      font-size:12px; font-style:normal;
                      font-weight:normal; letter-spacing:normal;
                      text-align:start; text-indent:0px;
                      text-transform:none; white-space:normal;
                      word-spacing:0px; text-decoration:none;
                      float:none; display:inline!important">_______________________________________________</span><br
                      class="" style="font-family:Helvetica;
                      font-size:12px; font-style:normal;
                      font-weight:normal; letter-spacing:normal;
                      text-align:start; text-indent:0px;
                      text-transform:none; white-space:normal;
                      word-spacing:0px; text-decoration:none">
                    <span class="" style="font-family:Helvetica;
                      font-size:12px; font-style:normal;
                      font-weight:normal; letter-spacing:normal;
                      text-align:start; text-indent:0px;
                      text-transform:none; white-space:normal;
                      word-spacing:0px; text-decoration:none;
                      float:none; display:inline!important">NeXus
                      mailing list</span><br class=""
                      style="font-family:Helvetica; font-size:12px;
                      font-style:normal; font-weight:normal;
                      letter-spacing:normal; text-align:start;
                      text-indent:0px; text-transform:none;
                      white-space:normal; word-spacing:0px;
                      text-decoration:none">
                    <span class="" style="font-family:Helvetica;
                      font-size:12px; font-style:normal;
                      font-weight:normal; letter-spacing:normal;
                      text-align:start; text-indent:0px;
                      text-transform:none; white-space:normal;
                      word-spacing:0px; text-decoration:none;
                      float:none; display:inline!important"><a
                        href="mailto:NeXus@nexusformat.org"
                        class="moz-txt-link-freetext"
                        moz-do-not-send="true">NeXus@nexusformat.org</a></span><br
                      class="" style="font-family:Helvetica;
                      font-size:12px; font-style:normal;
                      font-weight:normal; letter-spacing:normal;
                      text-align:start; text-indent:0px;
                      text-transform:none; white-space:normal;
                      word-spacing:0px; text-decoration:none">
                    <span class="" style="font-family:Helvetica;
                      font-size:12px; font-style:normal;
                      font-weight:normal; letter-spacing:normal;
                      text-align:start; text-indent:0px;
                      text-transform:none; white-space:normal;
                      word-spacing:0px; text-decoration:none;
                      float:none; display:inline!important"><a
                        href="https://lists.nexusformat.org/mailman/listinfo/nexus"
                        class="moz-txt-link-freetext"
                        moz-do-not-send="true">https://lists.nexusformat.org/mailman/listinfo/nexus</a></span></div>
                </blockquote>
              </div>
              <br class="">
            </div>
          </div>
        </div>
      </div>
      <br>
      <fieldset class="moz-mime-attachment-header"></fieldset>
      <pre class="moz-quote-pre" wrap="">_______________________________________________
NeXus mailing list
<a class="moz-txt-link-abbreviated" href="mailto:NeXus@nexusformat.org">NeXus@nexusformat.org</a>
<a class="moz-txt-link-freetext" href="https://lists.nexusformat.org/mailman/listinfo/nexus">https://lists.nexusformat.org/mailman/listinfo/nexus</a>
</pre>
    </blockquote>
  </body>
</html>