||A StreamStore where the data on-disk is compressed,
using the crazy Visio LZW
||A stream that holds pointers, possibly in addition to some
other data too.
||Base of all Streams within a HDGF document.
||Holds the representation of the stream on-disk, and
handles de-compressing it as required.
||A Stream which holds Strings.
||The TrailerStream is a special kind of Stream containing pointers,
and some core document settings.
||A placeholder for a stream where we don't known anything
about how to process / handle it