Dear Rahul, dear all,
the result value of an XPath-selection is limited to an XPathConstants.NODE
as of XPathEvaluator#evalLocation(Context, String). Having a root element is
reasonable for assignments etc. but I'd need to select a NodeSet based on the
XPath predicates first (and then wrap it evt. into a result element).
My use case resembles the form interpretation algorithm (FIA) of VXML: the
<datamodel> of a state is updated continually by the payload of arriving events
(inputs). There is an UI (form) which reflects the current datamodel and on
each
change the remaining "empty" <data> items should be selected and presented for
completion:
<state id="collectInput">
<datamodel>
<data id="statedata">...</data>
<data id="empty"><my:empty xmlns:my="urn:myns"/></data>
</datamodel>
<transition event="submit">
<!-- store input -->
<assign expr="$_eventdata/data" location="$statedata/datait...@id =
$_eventdata/data/@id]"/>
<!-- test for remaining empty fields, wrap resulting NodeSet into
"my:empty" element -->
<assign expr="my:filter($statedata/item[. = ''],'my:empty')"
location="$empty" />
<myfn:updateGUI/>
</transition>
<transition cond="count($empty/my:empty) = 0" target="nextInputState" />
</state>
Although the XPathEvaluator accpets XPathFunctions as constructor arguments,
there are no public accessors to the namespace and variable contexts. Could you
please provide an exmaple how to accomplish access to a data NodeSet using an
XPathFunction or an other way ?
Many thanks !
Jaro
--
Jaroslav Pullmann
Web Compliance Center - Fraunhofer FIT
Schloss Birlinghoven, D-53757 Sankt Augustin, Germany
Phone: +49-2241-142623 Fax: +49-2241-142065
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