[xquery-talk] XPath Expression help

[Todd Ditchendorf]

I realize this is an XQuery list, but I know that this list is  
particularly good at constructing tricky XPath expressions, so I hope  
you don't mind.

I need some help constructing an XPath. I am currently restricted to  
XPath 1.0 syntax.

I have a document like this:

<dict>
<key>AllowedKey1</key>
<value/>
<key>AllowedKey2</key>
<value/>
<key>AllowedKey3</key>
<value/>
<key>UnrecognizedKey</key>
<value/>
</dict>



So I have fixed set of allowed <key> element string-values  --  
('AllowedKey1', 'AllowedKey2', 'AllowedKey3')

It is not required that all three be present. 0-unbounded allowed key  
values may be present.

However, if there is a single key outside of that set, I would like  
to detect it.

Can anyone create an XPath 1.0 expression that will return true if an  
unrecognized key string-value is present?


Todd Ditchendorf
Software Engineer
itod at apple.com



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