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The module liquibase.xml file is the newer alternative to the sqldiff.xml file.
- Put the liquibase.xml file in the metadata folder (next to your config.xml)
- The liquibase file is run after any found sqldiff.xml file. This is so module's aren't forced to rewrite their sqldiff files into liquibase files for openmrs 1.7.
- See http://www.liquibase.org/manual/home#available_database_refactorings for xml element options
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