ODF Validator is a tool that validates OpenDocument files and checks them for certain conformance criteria. It is available as Java library for command line or embedded use, as well as a servlet. An instance of the servlet is hosted online courtesy of the OpenDoc Society. ODF Validator is part of the [Apache ODF Toolkit].
Apache ODF Validator gives many false-negatives and false-positives (...) [b]ut (..) the schemas are publicly available and the method to validate is well defined by OASIS (...).