1. Remove assumption of style from
   •  Style Implementation
   • SAX Parser
   • DOM Parser
   • XDO Parser
   • XMS-XSD Bindings
2. Copy existing Filter Implementations, and remove AbstractFilter superclass
3. Package up as a FilterFactoryImpl
4. Use a hint to try out existing test cases with FilterFactoryImpl
5. When encountering geotools FilterVisitor; rewrite as a geoapi FilterVisitor (use DuplicatingFilterVisitor as an example)
   • For PrePostFilterVisitorSQLGeneratorMagicSuperClassThing a new super class is already available FilterToSQL
6. When encoutering a geotools Filter or Expression follow the update instructions to search and replace the OpenGIS counterpart
7. Move org.geotools.filter interfaces to "legacy" module