Main Document Story
The contents of the main document story—the only story that is required in a valid WordprocessingML document—are encapsulated within the <body>
element. The content of the main document body is a collection of block-level structures, which are those WordprocessingML elements that can contain and/or be sibling elements with a WordprocessingML paragraph.
Within the document body, the valid set of block level content is:
Paragraphs
Tables
Custom markup (custom XML, structured document tags)
Section properties
Annotations (comments, revision markers, range permission markers)
Alternate format chunks
Each of these block-level content constructs (the 'building blocks' of WordprocessingML) is defined in the following subclauses.