repeating nodes, multiple attributes

Given a node type with 3 defining attributes (i.e., primary key) ...

<someNode a=aValue b=bValue c=cValue>
 <data>target</data>
</someNode>

... is it possible to access data from 1 of n of these using some form of
logical AND?

For example ...

<xsl:variable name="theData" select="someParent/someNode[@a='aKey' and
@b='bKey' and @c='cKey']/data" />

Thanks.
Mik


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