STANDARDIZE generated Java:

• classes generated by DIFFERENT JAXB IMPLEMENTATIONS may not be compatible with each other

Preserve XML equivalence:

• unmarshalling XML to objects and marshalling BACK to XML may not result in equivalent XML

Bind existing JavaBeans to schemas:

•  can only marshal and unmarshal classes generated by JAXB
• may be added later

Schema evolution support:

• can’ t modify previously generated code to support schema changes
• must generated new code

Allow generated Java to access:

XML elements/attributes not described in initial schema

Partial binding:

• unmarshalling only a subset of an XML document breaks round tripping

Implement every feature of the schema language:

• it’ s tough to implement all of XML Schema!

Support DTDs:

•  focusing on XML Schema
• DTDs were SUPPORTED in an earlier version, but won’ t be anymore
• tools for converting DTDs to XML Schemas exist

Standardize generated Java:

Preserve XML equivalence:

Bind existing JavaBeans to schemas:

Schema evolution support:

Allow generated Java to access:

XML elements/attributes not described in initial schema

Partial binding:

Implement every feature of the schema language:

Support DTDs: