On 28 Mar 2014, at 16:21, Dimitre Novatchev <dnovatchev(_at_)gmail(_dot_)com>
wrote:
On Fri, Mar 28, 2014 at 9:13 AM, Michael Kay <mike(_at_)saxonica(_dot_)com>
wrote:
Yes - but the challenge is to find out that a map is an instance of
map(xs:string, element(emp)) or whatever, if you want to know what kind of
map you have been given.
Yes, we only have function-lookup() which uses the function name and
arity -- not the exact signature. And anyway, it is to be used in
"pull style" not in "push style".
I gather that function-lookup() cannot be used for maps, although a
map is a function. Is this right?
function-lookup() will only access named functions, a map is an anonymous
functions.
Or probably there are new things coming in XPath 3.1?
There's no plan to do types-as-first-class-objects.
In Saxon there is an extension to access schema components including schema
types as functions -- see
http://www.saxonica.com/documentation/index.html#!functions/saxon/schema
It would be quite possible to use the same kind of model to represent item
types and sequence types.
Michael Kay
Saxonica
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