FW: [xml-dev] having problems with the "|" in field's element in the xs:key el ement

[Bill Riegel <BRiegel@lgc.com>]

It seems from the discussion that you can have the Pipe, "|" in the field
xpath. So why does Xerces fails when parsing this student3.xml

Xerces fails when parsing the student3.xml
SEVERE: java.lang.RuntimeException: org.xml.sax.SAXParseException: Identity
Constraint error (cvc-identity-constraint.4.2.1):  element
"studentActivities" has a key with no value.


My guess is that it only sees the act:name in the field definition
	<field xpath="act:name|act:desc"/>

Note: If I have only name elements under activity. Xerces is happy.

So what is wrong ?


Schema
<?xml version="1.0" encoding="UTF-8"?>
<schema targetNamespace="http://www.exampleU.com/activity";
xmlns="http://www.w3.org/2001/XMLSchema";
xmlns:act="http://www.exampleU.com/activity"; elementFormDefault="qualified">
  <element name="studentActivity">
    <complexType>
      <sequence>
        <element name="studentID" type="normalizedString"/>
        <element name="activity" type="normalizedString"/>
        <!--<element name="studentID" type="IDREF"/> -->
      </sequence>
    </complexType>
  </element>
  <element name="activity">
    <complexType>
      <sequence>
        <choice>
          <element name="name" type="normalizedString"/>
          <element name="desc" type="normalizedString"/>
        </choice>
        <element name="fee" type="decimal"/>
      </sequence>
    </complexType>
  </element>
  <element name="studentActivities">
    <complexType>
      <sequence>
        <element ref="act:studentActivity" maxOccurs="unbounded"/>
        <element name="activities">
          <complexType>
            <sequence>
              <element ref="act:activity" maxOccurs="unbounded"/>
            </sequence>
          </complexType>
        </element>
      </sequence>
    </complexType>
    
    <keyref name="krActivity" refer="act:kActivity">
      <selector xpath="act:studentActivity"/>
      <field xpath="act:activity"/>
    </keyref>
    
    <key name="kActivity">
      <selector xpath="act:activities/act:activity"/>
      <field xpath="act:name|act:desc"/>
    </key>
  </element>
</schema>

instance
<?xml version="1.0" encoding="UTF-8"?>
<!-- edited with XMLSPY v5 rel. 4 U (http://www.xmlspy.com) by James L.
Blunt (Landmark Graphics Corp.) -->
<studentActivities xmlns="http://www.exampleU.com/activity";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://www.exampleU.com/activity
 student3.xsd">
  <studentActivity>
    <studentID>sn42</studentID>
    <activity>Swimming</activity>
  </studentActivity>
  <studentActivity>
    <studentID>sn44</studentID>
    <activity>Polo</activity>
  </studentActivity>
  <studentActivity>
    <studentID>sn49</studentID>
    <activity>Swimming</activity>
  </studentActivity>
  <studentActivity>
    <studentID>sn11</studentID>
    <activity>Swimming</activity>
  </studentActivity>
  <studentActivity>
    <studentID>sn43</studentID>
    <activity>Bowling</activity>
  </studentActivity>
  <activities>
    <activity>
      <!--<name>Swimming></name> -->      <!-- if I uncomment name -->
      <desc>Swimming</desc>               <!-- and comment out desc -->

      <fee>47.50</fee>                    <!-- it works             -->
    </activity>
    <activity>
      <name>Polo</name>
      <!--<name>Swimming</name> -->
      <fee>789.99</fee>
    </activity>
    <activity>
      <name>Bowling</name>
      <fee>38.50</fee>
    </activity>
  </activities>
</studentActivities>

Bill Riegel
LandMark Graphics
713-839-3388

-----Original Message-----
From: Bob Foster [mailto:bob@objfac.com] 
Sent: Wednesday, May 21, 2003 8:38 PM
To: Jeff Lowery; xml-dev@lists.xml.org
Subject: Re: [xml-dev] having problems with the "|" in field's element in
the xs:key el ement

From: Jeff Lowery
>I'm not sure either one is doing a complete job of validating the schema.
>While XSV is the most correct, it doesn't complain if you remove either
>act:name or act:desc from the key's field XPath (neither does SQC).
>It would seem that it should, since both fields are in a choice model
>group, and if the one in the key field is missing XSV will throw a
>document validation error.

XSV doesn't complain if you remove, say, the act:desc alternative from the
key field xpath, provided act:desc is never used in an activity instance.

However, if act:desc is used in an instance instead of act:name, it
complains "missing one or more fields...from key".

This seems right. The validation rule in 3.11.4 para 4.2 only requires that
all actual elements have unique keys. I don't see anything that requires a
processor to warn that some otherwise valid instance might have a missing
key.

Bob


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