Base Class and Application Definition development questions

[sanbrock]

• NX_COMPLEX (a new Nexus type for complex numbers) definitions#1066
• NXroot@default - is it defined in NDXL anywhere? #121
• symbol - for any levels including 'root'? #120
• References inside NeXus uses links. Can we use/introduce something like PID? #122
• Extend HTML documentation of base classes for overrides definitions#1057
• Use of enumerations is inconsistent - proposal for improvement definitions#1058
  Proposal:
  • enum list are inherited
  • enum list are overriding inherited lists
  • inheritance comes from the direct super class
• Are the new doc strings extending (specialising) or overriding the inherited doc? definitions#1059
  E.g. if NXdetector_module/data_origin is overwritten by 
NXdetector/detector_module/data_origin, and then
 NXmyappdef:/detector (NXdetector)/detector_module(NXdetector_module) is used will it inherit from NXdetector_module or from NXdetector/NXdetector_module?
  Proposal:
  • documentation shall not override, but rather extend and/or specialise
• support for derived unit types (NX_COMPOSITE) -- NX_COMPOSITE -- a derived unit type definitions#1067
  Proposal:
  • unidata composition shall be supported
  • unidata 'unknown' could be used if derivation has not actually been performed
• How to require (in NXDL) a data item from a predefined set? definitions#1064
• Similarly, if we specify multiple optional fields/groups, how can we enforce that at least one of them shall be present
• How to describe (in NXDL) that a given element should be a link to another element? definitions#1065
• Name resolution: If there are 2 'groups' with name_type=any (or no specific name given) how can we resolve them when reading hdf5 groups from a file? Similar question for 'fields' where even the presence of hdf5 attribute 'NX_class' does not help? Is it the responsibility of the AppDef developer to avoid such situation? #124
• Is 'default' attribute value an absolute reference or a relative one? definitions#1063
• base classes always extend NXobject. Can a base class extend another base class? #135
  • similar question for application definitions, although NXxkappa is already extending NXxbase
• can an application definition define multiple entries? #126
• Is it a rule that an appdef/entry/definition must be the name of the given appdef? definitions#1046

[prjemian]

Issues have been created from all discussion points. Closing this issue.