Spongiae is an object-oriented library giving common interface for various text document formats (plain text, HTML, ...) and translation formats (PO, XLIFF, etc.)
The package includes also some scripts for conversion between formats.
Version "alone" contains Spongiae only: it works, but does not support segmentation. Version "withDeps" contains a subset of Culter to enable segmentation.
The version which is actually distributed has very basic support for tags inside segments, and only for html format. This support is inactivated when you use segmentation (until a known bug in git/master version will be corrected). Note also that other tools from the Ruber suite are actually based on a version without tags (since they use filters as read-only, this is not necessarily problematic)