Jyoti Jacob Alpa Sachde Sharma Chakravarthy CX-DIFF: a change detection algorithm for XML content and change visualization for WebVigiL. 209-230 2005 52 Data Knowl. Eng. 2 https://doi.org/10.1016/j.datak.2004.05.006 db/journals/dke/dke52.html#JacobSC05