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titleMigrating XPath rules from version 2.0 to 2.1+

Since version 2.1, grammar rule names are in uppercase, and each word in seperated by an underscore, such as: "COMPILATION_UNIT"
In version 2.0, camel cases was used, such as in "compilationUnit".
To convert XPath expressions written for version 2.0 to ones valid in 2.1, simply add underscores between words and uppercase.