DTAG is a versatile annotation tool that
supports manual and semi-automatic annotation
of a wide range of linguistic phenomena,
including the annotation of syntax,
discourse, coreference, morphology,
and word alignments. It includes commands
for editing general labeled graphs
and graph alignments, comparing annotations,
managing annotation tasks, and interfacing
with a revision control system.
Its visualization component can display
graphs and alignments for entire texts in a
compact format, with a highly flexible and
configurable formatting scheme. It also
provides a powerful search-replace mechanism
with queries based on full first-order
logic, which can be used to search for
linguistic constructions and automatically
apply graph transformations to collections
of annotated graphs
