XSLT 1.0: Select children based on arbitrary node?

[Zachary Turner]

I want to select some nodes based on whether or not another node
exists in another part of the document with the exact same name.
For example,

<special-location>
<special-element value="some-element"/>
<special-element value="some-element-two"/>
</special-location>

<root>
<some-element .../>
<some-element-two .../>
<some-other-element .../>
</root>
What I want to do is select only the first and second elements under
<root>, and ignore the third element since there is no <special-
elementnode with @value=some-other-element.

Is this possible with a simple XPath, or do I need to use more
complicated logic and branching structures?

[Bjoern Hoehrmann]

* Zachary Turner wrote in comp.text.xml:

>I want to select some nodes based on whether or not another node
exists in another part of the document with the exact same name.

For example,

<special-location>
<special-element value="some-element"/>
<special-element value="some-element-two"/>
</special-location>

<root>
<some-element .../>
<some-element-two .../>
<some-other-element .../>
</root>
What I want to do is select only the first and second elements under
<root>, and ignore the third element since there is no <special-
elementnode with @value=some-other-element.

Well it would be something like

*[ //special-element/@value = local-name() ]

This selects a child element of the context node if there is a special-
element element whose value attribute has the same value as the local-
name of the current node.
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