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When creating a new XML document that is Schema-constrained, allow the user to select which schema to use from those already existing in the catalog. For example, when creating a webapp via a maven archetype, you may wish to add a faces-config.xml file based on the Java Server Faces Catalog > web-facesconfig_1_2.xsd. The appropriate xml:ns can then be inserted automatically along with the root etc. Similar to creating a new XML document in Eclipse.
this seems to be rather enhancement, I reassign it to xml module for evaluation
I personally wanted to do this for 6.0, but unfortunately we couldn't. See issue 99062.