https://wiki.cansas.org/api.php?action=feedcontributions&feedformat=atom&user=164.54.96.106canSAS - User contributions [en]2026-05-06T14:35:07ZUser contributionsMediaWiki 1.39.4https://wiki.cansas.org/index.php?title=Data_Formats_Working_Group&diff=67Data Formats Working Group2007-12-12T16:43:52Z<p>164.54.96.106: PRJ: added more organizational details and summarized email discussion to date</p>
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<div>[http://smallangles.net/pipermail/cansas-1dwg_smallangles.net/ Mailing List Archive]<br />
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===Timeline===<br />
* 2007-12-31 agree on v1.0 format<br />
* 2008-01-01 start implementing v1 at facilities<br />
* 2008-06 representative sampling of data available for inter-facility comparison<br />
* 2008-10 presentation of results at NOBUGS2008 meeting (date TBA)<br />
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===Considerations===<br />
* a key point of what we discussed at NIST: <br />
namely that our goal is to agree a format which that whilst using as much best XML practice as is reasonable, leaves the file instantly human-readable, editable in the simplest of editors, and importable by simple text import filters in programs that don't recognise the XML.<br />
* document what we decide<br />
**1DWG will take care of documenting the format it defines.<br />
*** make that definition with a schema (for absolute validation of any proposed XML file against the standard)<br />
*** instructions on how to use that schema<br />
*** XSL style sheets to present the XML contents in various forms (also serves as examples)<br />
*** a couple of examples<br />
*** maybe also some words.<br />
** move some of this discussion to<br />
*** discussion page<br />
*** other wiki pages<br />
*** /dev/null after its usefulness has been exhausted<br />
* coordinate with other communities<br />
** [http://www.nexusformat.org NeXus (http://www.nexusformat.org)]<br />
** reflectivity <br />
** powder diffraction<br />
*** [http://www.xrdml.com XRDML (http://www.xrdml.com)]<br />
* should we consider a file naming convention?<br />
* should we consider a SAS scan naming convention?<br />
** sequential run number from facility<br />
** convention set by the detector software provider<br />
* XML representation of the I vs. Q data<br />
** tabular format<br />
** vector format<br />
* general XML coding style<br />
** readability by humans<br />
*** with lots of computer skills<br />
*** with rudimentary computer skills<br />
** readability by computers<br />
*** standard XML libraries<br />
*** generic visualization tools<br />
*** common software such as MS Excel or Open Office or [ftp://ftp.ill.fr/pub/cs/rxml XMLPLO source code for windows/linux/OSX86]<br />
** availability of style sheets<br />
* scalability of XML format to 2D data?<br />
* What is required?<br />
* What is optional?<br />
* Use the same tags again in similar contexts<br />
** X,Y pairs for example, whether detector position, beam center, sample position<br />
{| width="100%" border="1" style="border:1px solid navy; border-collapse: collapse"<br />
|-<br />
! width="50%" | inconsistent<br />
! width="50%" | consistent<br />
|-<br />
| <pre><br />
<beam_size axis="x" units="mm">12.00</beam_size><br />
<beam_size axis="y" units="mm">12.00</beam_size><br />
<x0 units="mm">322.64</x0><br />
<y0 units="mm">327.68</y0><br />
<pixel_x units="mm">5.00</pixel_x><br />
<pixel_y units="mm">5.00</pixel_y><br />
</pre> <br />
| <pre><br />
<beam_size axis="x" units="mm">12.00</beam_size><br />
<beam_size axis="y" units="mm">12.00</beam_size><br />
<beam_center axis="x" units="mm">322.64</beam_center><br />
<beam_center axis="y" units="mm">327.68</beam_center><br />
<pixel_size axis="x" units="mm">5.00</pixel_size><br />
<pixel_size axis="y" units="mm">5.00</pixel_size><br />
</pre> <br />
|}<br />
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===Points for Discussion===<br />
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*Do we want to advocate/recommend particular names for particular tags; eg, SASdata, SASsample, Idata, etc.?<br />
** which ones?<br />
* provide for (optional) inclusion of sample prep details<br />
* provide for (optional) inclusion of other (non-SAS) data in the XML<br />
* Need to allow for more than a single SAS data set in one .xml file<br />
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===Other Points===<br />
* It's not clear how to specify that multiple runs were reduced together<br />
* How does one include the instrument information of the many runs that we used to make up the composite file<br />
* If we have reduction information, then everything needs to be in there, i.e. the run numbers for the can, the standard, the uniform field, etc.<br />
* Information on the averaging, is it radial, sector, rectangular, etc.<br />
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===Members===<br />
* Andrew Jackson (NIST)<br />
* Pete Jemian (APS)<br />
* Steve King (ISIS)<br />
* Ken Littrell (ORNL)<br />
* Andy Nelson (ANSTO)<br />
* Ron Ghosh (ILL)<br />
* Jan Ilavsky (APS)<br />
===News/Status===<br />
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[[Category:Working Groups]]</div>164.54.96.106