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Using XPath to find EMF elements

EMF / XPath

Using Ecliptical's XPath Support for EMF plugin, you can browse through an EMF document using XPath syntax.

It extends Jaxen to wrap around a given EClass. But unfortunately it loses all concept of attributes, so ns:root[@ns:name='foo'] has to become ns:root[ns:name='foo'].

However, as of March 2011 this update site has vanished. Since it is licensed under the EPL, a mirror of the plugin is provided through the IAML update site. (IAML Installation Instructions)

Accessing types in Ecliptical XPath

If you are trying to access the type of an EMF node, you could expect something like this to work:

EMFXPath xpath = new EMFXPath("//iaml:children[contains(xsi:type, 'SyncWire')]");
xpath.addNamespace("iaml", ModelPackage.eNS_URI);
xpath.addNamespace("xsi", "http://www.w3.org/2001/XMLSchema-instance");
return xpath.selectNodes(root);

However, since we are adapting around an existing EMF model and not the source XML file, this property is not available. The solution is to use the eClass() function:

EMFXPath xpath = new EMFXPath("//iaml:children[contains(eClass(), 'SyncWire')]");

This additional function is provided to Jaxen as ca.ecliptical.emf.internal.xpath.EClassFunction.
Categories: EMF | XML
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Last edited by jevon jevon 81 months ago