Namespaces in E4X

ECMAScript for XML (E4X) extends JavaScript with support for XML-based data manipulation by introducing new XPath-like language features. Apache ODE/WSO2 BPS has an E4X Assign activity to ease Rich Data Manipulation in BPEL using E4X. To use namespaces in E4X queries, follow the syntax namespace::localName in place of a normal element specifier. Eg: To extract the hotelRequestId from the variable submitHotelReviewRequest which has a format similar to the following:

	<message>
	<submitHotelParameters>
	<submitHotelReview xmlns="http://test.bpel.e4x/sample" >
	<hotelRequestDetail xmlns="">
	<hotelRequestId>007</hotelRequestId>
	<origin>CMB</origin>
	</hotelRequestDetail>
	</submitHotelReview>
	</submitHotelParameters>
	</message>

view raw gistfile1.xml hosted with ❤ by GitHub

You can use a js snippet as follows:

	<bpel:assign validate="no" name="AssignE4X">
	<bpel:extensionAssignOperation>
	<js:snippet xmlns:js="http://ode.apache.org/extensions/e4x">
	<![CDATA[
	var xyz = new Namespace('http://test.bpel.e4x/sample');
	print("Received Request ID:" + submitHotelReviewRequest.submitHotelReviewParameters.xyz::submitHotelReview.hotelRequestDetail.hotelRequestId);
	]]>
	</js:snippet>
	</bpel:extensionAssignOperation>
	</bpel:assign>

view raw gistfile1.xml hosted with ❤ by GitHub

Related Links:
https://developer.mozilla.org/en-US/docs/E4X/Processing_XML_with_E4X
http://www.taval.de/publications/INPROC-2009-25/
http://stackoverflow.com/questions/922668/e4x-grab-nodes-with-namespaces