Base of all chunks, which hold data, flags etc
A special kind of command that holds the offset to a block
A command in the visio file.
Factor class to create the appropriate chunks, which needs the version of the file to process the chunk header and trailer areas.
A chunk header
A chunk header from v11+
A chunk header from v4 or v5
A chunk header from v6
A separator between the trailer of one chunk, and the header of the next one
A trailer that follows a chunk
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