Re: [lxml-dev] XPath id function on newly created elements

Aug. 23, 2005

      Martijn Faassen writes:
...
I'm confused about basic principles here: how do you define an id
in a Relax NG schema?
<grammar [...] datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
  [...]
  <define name="attlist.mads" combine="interleave">
    <attribute name="id">
      <data type="ID"/>
    </attribute>
  </define>
  [...]
</grammar>

seems to be how.

(Note, I didn't write the schema, and I'm consequently not
particularly in a position to change to using xml:id. However, I will
if there's no other way, using lxml, to achieve what I need with new
ids being recognised as such - and I can use an XML Schema or a DTD
rather than RELAX NG if that makes a difference.)

This is certainly what's allowing the XPath id function to work -
before validating against the schema it doesn't work, and subsequently
it does.
...
I'm still at a loss how you got your original ids recognized in the 
first place. Perhaps you can provide a small sample XML document, a 
small sample XPath statement, and, if this is possible, a sample small 
Relax NG that declares an id.
Sample XML:

<?xml version="1.0" encoding="utf-8"?>
<madsCollection xmlns="http://www.loc.gov/mads/">
  <mads id="name-000001">
    <authority>Some text</authority>
  </mads>
</madsCollection>

Sample XPath:

id('name-000001')

Sample RELAX NG schema (this should work, but I have just now manually
cut out stuff that isn't used in the document above):

<?xml version="1.0" encoding="UTF-8"?>
<grammar ns="http://www.loc.gov/mads/" xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
  <define name="madsCollection">
    <element name="madsCollection">
      <ref name="attlist.madsCollection"/>
      <oneOrMore>
        <ref name="mads"/>
      </oneOrMore>
    </element>
  </define>
  <define name="attlist.madsCollection" combine="interleave">
    <empty/>
  </define>
  <define name="mads">
    <element name="mads">
      <ref name="attlist.mads"/>
      <ref name="authority"/>
    </element>
  </define>
  <define name="attlist.mads" combine="interleave">
    <attribute name="id">
      <data type="ID"/>
    </attribute>
  </define>
  <define name="authority">
    <element name="authority">
      <ref name="attlist.authority"/>
      <text/>
    </element>
  </define>
  <define name="attlist.authority" combine="interleave">
    <empty/>
  </define>
  <start>
    <ref name="madsCollection"/>
  </start>
</grammar>

Jamie
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Re: [lxml-dev] XPath id function on newly created elements

Jamie Norrish