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References across several XML files [message #2173] Sat, 13 April 2019 04:12 Go to previous message
Jörg von Lingen is currently offline  Jörg von Lingen
Messages: 15
Registered: March 2016
Junior Member
Dear all,

during the conference in Linz the question about references in railML3.x was
raised. Currently the referencing in IS-IL is using the ID/IDREF mechanism of
XML or alternatively UUIDs. At least the first option can be validated only,
when reference and target are within the same XML file. However, in future
scenarios only parts of the information will be exchanged, e.g. a new timetable
will not repeat the complete infrastructure but needs referencing into it.

Thus the option of using the <designator> element available at
FunctionalInfrastructureEntity and EntityIL instead. When using an official
register the name shall be unique in the register. However, it may appear at
least twice when used for IS part and IL part, e.g. signalIS/designator and
signalIL/designator.

There is another issue with using designator as it has two mandatory attributes
@register and @entry. Thus a reference to designator shall be always contain the
complete tuple of @register and @entry to be unambiguous.

What is your opinion on the topic of references?

--
Best regards,
Joerg v. Lingen - Interlocking Coordinator
 
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