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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Hi Nicolas, hi Ben,<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>The NXarchive application is giving a minimum of provenance information and lets someone not involved in the measurement know what the measurement was about and who was involved in the measurement. Although some fields perhaps could be revised. My interpretation of this application definition would be: if an archived dataset does not have this information, it would not comply with the reusable </span><b><span style='font-size:14.0pt;mso-fareast-language:EN-US'>(R)</span></b><span style='mso-fareast-language:EN-US'> requirement of FAI</span><b><span style='font-size:14.0pt;mso-fareast-language:EN-US'>R</span></b><span style='mso-fareast-language:EN-US'> <o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Maybe the description relating it to the ICAT is a bit misleading. <o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Best wishes,<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Heike<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=DE>Von:</span></b><span lang=DE> NeXus <nexus-bounces@shadow.nd.rl.ac.uk> <b>Im Auftrag von </b>Watts Benjamin (PSI) via NeXus<br><b>Gesendet:</b> Dienstag, 19. April 2022 13:15<br><b>An:</b> nexus@nexusformat.org; Discussion forum for the NeXus data format <nexus@shadow.nd.rl.ac.uk><br><b>Cc:</b> Watts Benjamin (PSI) <benjamin.watts@psi.ch><br><b>Betreff:</b> Re: [Nexus] NXarchive / compression standards<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div id=divtagdefaultwrapper><p><span style='font-size:12.0pt;color:black'>Hi Nicolas,<o:p></o:p></span></p><p><span style='font-size:12.0pt;color:black'> NXarchive was discussed and accepted by the NIAC a long time ago and hasn't had any significant updates since. I think you might need to talk to the ICAT project to get further detail. Perhaps you could encourage the ICAT project to provide updates for the NXarchive documentation, if it is warranted/useful. For HDF5 compression, we generally recommend sticking to the compression filters already included in the HDF libraries, like ZLIB.<o:p></o:p></span></p><p><span style='font-size:12.0pt;color:black'><o:p> </o:p></span></p><p><span style='font-size:12.0pt;color:black'>Cheers,<o:p></o:p></span></p><p><span style='font-size:12.0pt;color:black'>Ben<o:p></o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:12.0pt;color:black'><o:p> </o:p></span></p><div><div class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;color:black'><hr size=2 width="98%" align=center></span></div><div id=divRplyFwdMsg><p class=MsoNormal><b><span style='color:black'>From:</span></b><span style='color:black'> NeXus <<a href="mailto:nexus-bounces@shadow.nd.rl.ac.uk">nexus-bounces@shadow.nd.rl.ac.uk</a>> on behalf of Nicolas Soler via NeXus <<a href="mailto:nexus@shadow.nd.rl.ac.uk">nexus@shadow.nd.rl.ac.uk</a>><br><b>Sent:</b> Monday, 11 April 2022 7:24 PM<br><b>To:</b> <a href="mailto:nexus@nexusformat.org">nexus@nexusformat.org</a><br><b>Cc:</b> Nicolas Soler<br><b>Subject:</b> [Nexus] NXarchive / compression standards</span><span style='font-size:12.0pt;color:black'> <o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:12.0pt;color:black'> <o:p></o:p></span></p></div></div><div><p><span style='font-size:12.0pt;color:black'>Dear all,<o:p></o:p></span></p><p><span style='font-size:12.0pt;color:black'>I'm new to this list so I may be inquiring about topics that have been discussed before. But anyway, I have two questions here:<o:p></o:p></span></p><p><span style='font-size:12.0pt;color:black'>1) I have noticed the presence of NXarchive in the application definitions. Does anybody know more about it beyond the provided description? (This is a definition for data to be archived by ICAT).<o:p></o:p></span></p><p><span style='font-size:12.0pt;color:black'>2) What about compression filters applied to the underlying HDF5 files? Is the rule to apply ZLIB by default or were there discussions or recommendation around particular techniques and associated data structures?<o:p></o:p></span></p><p><span style='font-size:12.0pt;color:black'>Many thanks in advance for your insights!<o:p></o:p></span></p><p><span style='font-size:12.0pt;color:black'>Nicolas<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:12.0pt;color:black'>-- <o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:12.0pt;color:black'><o:p> </o:p></span></p><div><div><div><div><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=400 style='width:300.0pt'><tr><td width=118 rowspan=2 style='width:88.5pt;padding:0cm 0cm 0cm 0cm'><p><a href="https://www.albasynchrotron.es/en/"><span style='text-decoration:none'><img border=0 width=118 height=59 style='width:1.2291in;height:.6145in' id="Bild_x0020_2" src="cid:image001.png@01D853F2.D54835A0"></span></a><o:p></o:p></p></td><td width=880 valign=top style='width:660.0pt;padding:3.75pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:#112E50'>Nicolas Soler </span></b><o:p></o:p></p></td></tr><tr><td width=880 valign=top style='width:660.0pt;padding:3.75pt 0cm 0cm 0cm'><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial",sans-serif'>Head of Scientific Data Management (SDM)<br>Computing division </span><o:p></o:p></p></td></tr><tr><td colspan=2 valign=top style='padding:3.75pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial",sans-serif'>ALBA SYNCHROTRON LIGHT SOURCE</span></b><o:p></o:p></p></td></tr><tr><td colspan=2 valign=top style='padding:3.75pt 0cm 0cm 0cm'><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial",sans-serif;color:black'><a href="https://www.albasynchrotron.es/en/about/coming-to-alba" target="_blank">Carrer de la Llum 2-26 | 08290 | Cerdanyola del Vallès| Barcelona | Spain </a><br>Phone: (+34) 93 592 45 64 </span><o:p></o:p></p></td></tr><tr><td colspan=2 valign=top style='padding:3.75pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:9.0pt;color:#112E50'><a href="http://www.albasynchrotron.es" target="_blank">www.albasynchrotron.es</a></span></b><b><span style='font-size:7.5pt;color:#112E50'> | </span></b><b><span style='font-size:9.0pt;color:#112E50'><a href="mailto:nsoler@cells.es">nsoler@cells.es</a> | <a href="https://www.albasynchrotron.es/en/about/legal-notice" target="_blank">legal notice</a> / <a href="https://www.sincrotroalba.cat/ca/que-es-alba/avis-legal">avís legal</a> / <a href="https://www.sincrotronalba.es/es/que-es-alba/aviso-legal" target="_blank">aviso legal</a> </span></b><o:p></o:p></p></td></tr><tr><td colspan=2 valign=top style='padding:3.75pt 0cm 0cm 0cm'><p class=MsoNormal> <o:p></o:p></p></td></tr><tr><td colspan=2 valign=top style='padding:6.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:8.0pt;color:#8A8A8A'>Please, do not print this e-mail unless it is absolutely necessary. <br></span></b><span style='font-size:8.0pt;color:#8A8A8A'>Si heu rebut aquest correu per error, us informo que pot contenir informació confidencial i privada i que està prohibit el seu ús. 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