- From: Richard Tobin <richard@inf.ed.ac.uk>
- Date: Thu, 28 Sep 2006 17:24:42 +0100 (BST)
- To: public-xml-processing-model-wg@w3.org
The semantics of a construct should describe: - which external ports are visible to the subpipelines within the construct - which new ports are provided to those subpipelines by the pipeline - what document is available on each of the new ports (the documents available on the visible external ports are of course those that were avilable to the construct itself) - probably something similar about parameters So the semantics of for-each will state that all the ports visible to the for-each itself are visible to the sub-pipeline, that an additional port (the iteration port) is visible, and that during successive executions of the sub-pipeline, the document available on the iteration port will be successive portions of the input document selected by the XPath. This does not seem to have any compositionality problem. An inner for-each that references an outer for-each's iteration port will see it as a constant, just because the semantics of the outer for-each specified the document that is available on it for a given iteration. -- Richard
Received on Thursday, 28 September 2006 16:24:38 UTC