Limiting nesting level in structured documents Structured documents often contain nestable elements. For example, a Section can contain subsections; an Item in a List might contain a sublist. Formatting typically changes for each level of nesting. The Title of a top-level Section might have a single-part number (1., 2., 3., and so forth), while the Title of a second-level Section has a two-part number (1.1., 1.2, 1.3, ....) and a third-level Section a three-part number (1.1.1, 1.1.2, 1.1.3, ...). Titles of more deeply nested Sections might not be numbered, and may change font size and other properties.
Nested lists may be progressively indented. Numbered lists may use different numbering conventions (1., 2., 3. and so forth) as opposed to (a., b., c., and so forth) for different levels. "Bulleted" lists can mark items in different levels of lists with different symbols (solid or outlined bullets), different shapes (circles, squares, or dashes).
An EDD can use either level rules or context levels to determine the
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