Telco 20220225

Date

Friday, 25th February, 14:00 UTC

Connect

Agenda

  • Welcome new members

  • Review previous meeting minutes and actions: January Telco

  • Recent issues on Github (especially those labelled with “telco”)

  • NeXus ontology and namespace usage

    • ?add to agenda for next NIAC?

  • Spring virtual NIAC

  • Autumn hybrid NIAC

Present

BW, CZ, HB, PJ, FA, SB, LG, RB, HG, AB, RO, WDN

Minutes

  • NIAC on March 3rd, 4th, with special effort to have a chorum on the 4th.

  • SB to make pull requests

  • Ontology email aacount - special email address that forwards to nexus-committee? Or is it just a login ID?

  • NXxpcs app def - want xpcs data in a common format - is ready for contribution

  • New type of units “arbitrary units”

  • SB prefers to calculate combination units on the fly

  • RO asks what is supposed to be the validation consequences of arb units?

  • BW says that au is problematic anyway because it is a nonstandard description that is commonly used (add to proposal #921)

  • SB thinks arb units is equivalent to unknown units.

  • RO and PJ can agee on “unkown” units as a compromise (NX cansas can consider using this)

  • PJ will make the changes in NXxpcs

  • LG wants to be able to state photon flux differently from NXmx since XFELs provide photons differently

  • Problem is that a pulse has unknown time

  • Other problem is that NDXL currently doesn’t easily allow requiring one of a set of fields.

  • AB and HB think this is just a bug and short name should be optional - AB will fix it

  • SB wants to have a nexus workshop in Germany 17-18 March to bring people and projects together

  • would like someone to introduce the NIAC, sample environment, validation, data processing/visualisation

  • BW volunteers to talk at the meeting.

  • AB thinks that he could also speak but needs to check beamtime schedule.

  • AB will add the NIAC vote needed tag to #942

  • SB asks about inheritance - HB says we should look at UML, which adresses this question. HB thinks there is value in having specific inheritance rules. BW would like to see a specific proposal to avoid endless ideological discussions.

  • SB asks about linking between fields and how a link can be required in an app def (using NXDL)

  • AB says that NeXus is meant to be independent of the file format implementation (i.e. HDF5 is not a requirement)

  • SB asks if someone from ESRF could speak at the workshop about NeXus use or utilities? WDN will discuss availability with colleagues.

  • BW will publish a NIAC schedule asap