On 24/10/2012 12:06, Costello, Roger L. wrote:
Hi Folks,
I read this in the XPath 3.0 specification:
XPath 3.0 is a composable language
What does that mean?
It means that every operator / language construct allows any expression
to appear as its operand, subject only to operator precedence and data
typing constraints. For example, you can do
3 + max(for $i in 1 to 10 return (if ($i gt 5) then $i*3 else $i*2)))
Contrast this with XSLT, which is not fully composable: XPath
expressions can be used as operands to XSLT instructions, but not the
other way around; similarly Java has constructs called statements that
cannot be nested inside expressions.
Michael Kay
Saxonica
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