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Language documentation projects all over the world have accumulated a large and heterogeneous corpus of linguistic material. Because of its diversity, access to and analysis of the components is difficult, particularly for multimedia instances. The "Graph Annotation Framework" (GrAF), a standoff annotation method, is applied to utterance examples in time-aligned annotations of video samples. An easy-to-use programming interface defined in the Poio API, a project within the CLARIN framwork ("Common Language Resources and Technology Infrastructure"), then greatly simplifies access without the need to deal with multiple input formats in the source material. GrAF-XML provides a basis for exchanging results among the various projects that analyze the corpus.