Almost every user of XML will, at some stage, need to do some form of comparison between different versions of their XML data or document. This could be because it is necessary to review the changes that have been made, or to check that the output from one version of some software is the same as the previous version.
Designers of XML formats often do not consider this requirement for comparison when designing an XML format. However, if this is taken into account at the design stage then it can make the usefulness of the XML greater and at the same time reduce the cost of developing software.
This paper discusses different aspects of XML grammar design that should be considered when document comparison is a requirement. Presented at XML London 2013, June 15-16th, 2013.
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