I am trying to check a nodeset for missing attributes using xpath:

the event looks like:

<nds dtdversion="3.0" ndsversion="8.x">
<source>
<product version="3.0.0.20051118 ">DirXML</product>
<contact>Novell, Inc.</contact>
</source>
<input>
<add class-name="group">
<add-attr attr-name="member">
<value association-ref="9698b8d54311ea4a83ed66db3d96512c"
timestamp="1175074757#1" type="dn">\path\to\meier-m</value>
<value association-ref="9698b8d54311ea4a83ed66db3d96512d"
timestamp="1175074757#1" type="dn">\path\to\meier-z</value>
<value timestamp="1175074758#1" type="dn">\path\to\tttt</value>
<value timestamp="1175074758#1" type="dn">\path\to\zzzz</value>
</add-attr>
</add>
</input>
</nds>

I need to match exactly on the nodes without xpath-attribute
"association-ref".

matching on add-attr[@attr-name='member']/value[@association-ref]/node()

gives me the nodes with association-ref available, but how do I match on
those without that attribute?

Thx, Thorsten