Finish partial XPath implementation.All unit tests for it pass now.
Add tests to test xmldom.XPath.
Use "use strict" to have more sanity checks.
Add command-line unit test with qtjsruntime.This has the advantage that all unit tests are run. The Rhino and Node.JS unit tests, while valuable, cover only part of the tests.
Add empty interface, class and test class for operational transformation.
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