FL_DocLayout is a formatted representation of a specific PD_Document, formatted for a specific GR_Graphics context.

A FL_DocLayout encapsulates two related hierarchies of objects.

The logical (or content) hierarchy corresponds to the logical structure of the document.

Where each fl_BlockLayout corresponds to a logical element in the PD_Document (i.e., usually a paragraph of text).

The physical (or layout) hierarchy, by contrast, encapsulates the subdivision of physical space into objects of successively finer granularity.

Where each fp_Run contains some fragment of content from the original document, usually text.

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