XPath expressions in xupdate:variable select attribute

[Richard Zschech]

Hi,
Im fairly new to XUpdate and Ive been playing with some examples and 
running them through the XUpdate processor to see the results.

I have an example, which appends an item of data and assigns it a zero 
based id, as follows and am wondering why it dosent work:

xupdate:

<xu:modifications version="1.0" xmlns:xu="http://www.xmldb.org/xupdate";>
 <xu:variable name="id" select="count(/data/item)"/>
 <xu:append select="/data">
   <xu:element name="item">
     <xu:attribute name="id">
       <xu:value-of select="$id"/>
     </xu:attribute>
   </xu:element>
 </xu:append>
</xu:modifications>
data:

<data>
 <item id="0"/>
</data>
error:
Exception in thread "main" java.lang.Exception: XPath leads not to a 
Node or NodeList !
       at 
org.xmldb.xupdate.lexus.commands.CommandObject.selectNodes(CommandObject.java:137)
       at 
org.xmldb.xupdate.lexus.commands.VariableCommand.execute(VariableCommand.java:97)
       at 
org.xmldb.xupdate.lexus.XUpdateQueryImpl.execute(XUpdateQueryImpl.java:188)

It gives a similar message if I dont use a variable and go:

     <xu:attribute name="id">
       <xu:value-of select="count(/data/item)"/>
     </xu:attribute>
It seems that the value of a vairable can only be a node or a node list 
and not a number or other primitive value. Is this correct acording to 
the spec or is a limitation of the implementation.

Thanks in advance,
From Richard.
--
______________________________________________________________________
Lars Martin                             mailto:[EMAIL PROTECTED]
SMB GmbH                                        http://www.smb-tec.com
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