RE: XSLT 2.0 and implementation of fn:idref in Saxon 7

No, the idref() function operates fine (at least in Saxon) with DTD-defined
IDREF and IDREFS attributes. The need to determine which attribute contains
the IDREF exists just as much in a DTD world as a schema world. The only
thing that schema adds is the ability for element content (as distinct from
attributes) to be typed as an ID or IDREF(S).

Michael Kay

# -----Original Message-----
# From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx [mailto:owner-xsl-
# list@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of David.Pawson@xxxxxxxxxxx
# Sent: 15 March 2004 10:50
# To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
# Subject: RE:  XSLT 2.0 and implementation of fn:idref in Saxon 7.9
# 
# Rather too subtle for me.
#   This appears to me to be a move away from 'simple' DTD based XML,
#    to an xsd model of ID+IDREF?
# 
#    What about operating on a DTD based valid instance which has
#    idrefs and id's correctly defined in the DTD?
# 
#    Ignored I guess?
# 
#     Another trip wire for the unwary?
# 
# regards DaveP
# 
#     # Did I misunterstand the meaning of the fn:idref (Finds
#     the elements that # link to the element with a given ID
#     value i.e. This function allows # reverse navigation from
#     IDs to IDREFs.) ?
# 
# 
#     Yes, you misunderstood it. The spec says: A node references
#     an ID value if
#     it is an element or attribute node whose type is xs:IDREF
#     or xs:IDREFS. So
#     if you have an attribute of type xs:IDREFS, then the
#     idref() function will
#     return that attribute, not the element containing it.
# 
#     The reason for this is that you can have several IDREF
#     attributes on an
#     element, e.g.
# 
#     <person id="id005" father="id001" mother="id002"/>
# 
#     You want to know not only that person id005 has a reference
#     to id001, but
#     which attribute contains this reference. You can always get
#     the element node
#     if you want, just use idref($x)/..
# 
#     Michael Kay
# 
# 
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