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ModeShape is a distributed, hierarchical, transactional, and consistent data store with support for queries, full-text search, events, versioning, references, and flexible and dynamic schemas. It is very fast, highly available, extremely scalable, and it is 100% open source and written in Java. Clients use the (JSR-283) standard Java API for content repositories (aka, JCR) or ModeShape's REST API, and can query content through JDBC and SQL.
Pro/Con Overview:
| Pro: | Con: |
|---|---|
| Supports JCR semantics (including optional functionality) | Commits us to JCR semantics or a superset |
| Offered by JBoss as a product with several years of history | |
| Do to JCR semantics, could persist content as well as relationships | |
| Has many beyond-JCR functionalities that could be useful to FF | Additional functionalities are unique to ModeShape |