Formatter

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.

• each FL_DocLayout contains a list of fl_SectionLayout objects
• each fl_SectionLayout are composed of fl_BlockLayout objects

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.

• each FL_DocLayout contains a list of fp_Page objects, each of which was constructed during the process of formatting the document
• each fp_Page is a list of fp_Columns (fp_Column)
• each fp_Column is a list of fp_Lines (fp_Line)
• each fp_Line is a list of fp_Runs (fp_Run)

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

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