Attribute Value Templates?

When computing generated text using xsl:value of and attribute value
templates, the spec is not clear on what to do if the number of nodes
selected by the select pattern return 0.  In this case, should the XSL
Processor throw an exception or should it just treat the evaluation of
the string expression as being invalid and therefore ignored.

"The value of a string expression that is a pattern is the character
content of the first node selected by the pattern. If the first node is
an attribute node, the value is the attribute value. If the first node
is an element node, the value is computed by concatenating all
characters that are descendants of the element node in the order in
which they occur in the document. The pattern is a select pattern and so
is implicitly anchored to the current node."

Nowhere in here does it say what to do if the select pattern returns no
nodes.

Tyler


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