[Nexus] questions about NXxas app definition

[Mark Koennecke]

Carlos,

On 08/29/2012 10:02 AM, Carlos Pascual wrote:
> ******************
> Sorry if this message is duplicated, the list reported a delivery error and I
> haven't seen the message appear afterwards, so I am resending.
> ******************
>
> Hello,
>
> I am trying to write a NXxas file following the Application definition from the
> the "NeXus Reference" document, and I have two questions/doubts about it:
>
> a) The monochromator energy appears as NX_CHAR type (and this is also the case
> for the NXxasproc application definition). I would expect it to be NX_FLOAT
> instead (that would be consistent with the NXmonochromator class definition). I
> see that the source XML file [1] does not include any explicit type for this
> field, so I wonder if it might be a mistake in the definition (which should be
> explicit) or in the script that generates the NeXus Reference (which perhaps
> defaults to NX_CHAR if no explicit type is defined?).
The energy must be NX_FLOAT. This is an error somewhere.
> b) The link in the NXdata group to the absorbed beam is made to
> "/entry/instrument/absorbed_beam"  (which is a NXdetector group). I would
> expect it to be to "/entry/instrument/absorbed_beam/data"  (an NXfield)
You are right here to: it must be /entry/instrument/absorbed_data/data

let us know how you get on with NXxas. There may be fields missing....


Regards,

                Mark Koennecke
> Can somebody please clarify these things?
>
> Cheers!
>
> Carlos
>
> Refs:
> [1]http://svn.nexusformat.org/definitions/trunk/applications/NXxas.nxdl.xml
>