(Article) A relatively self-contained body of text constituting a single narrative or exposition. Articles should be disjoint; that is, they should not contain other articles as constituent elements.

(Bibliography entry) A reference identifying the external source of some cited content.

(Block quotation) A portion of text consisting of one or more paragrahs attributes to someone other than the author of the surrounding text.

A brief portion of text describing a table or figure.

A fragment of computer program text.

(Division) A generic block-level element or group of elements.

An item of graphical content.

A mathematical formula.

(Heading) A label for a subdivision of a document’s content. It should be the first child of the division that it heads.

Heading with specific level, for use in applications that cannot hierarchically nest their sections and thus cannot determine the level of a heading from its level of nesting.

Heading with specific level, for use in applications that cannot hierarchically nest their sections and thus cannot determine the level of a heading from its level of nesting.

Heading with specific level, for use in applications that cannot hierarchically nest their sections and thus cannot determine the level of a heading from its level of nesting.

Heading with specific level, for use in applications that cannot hierarchically nest their sections and thus cannot determine the level of a heading from its level of nesting.

Heading with specific level, for use in applications that cannot hierarchically nest their sections and thus cannot determine the level of a heading from its level of nesting.

Heading with specific level, for use in applications that cannot hierarchically nest their sections and thus cannot determine the level of a heading from its level of nesting.

(List) A sequence of items of like meaning and importance.

(List body) The descriptive content of a list item.

(List item) An individual member of a list.

(Label) A name or number that distinguishes a given item from others in the same list or other group of like items. e.g. the number and punctuation in a numbered list.

(Nonstructural element) A grouping element having no inherent structural significance; it serves solely for grouping purposes.

(Paragraph) A low-level division of text.

A large-scale division of a document. This type of element is appropriate for grouping articles or sections.

(Private element) A grouping element containing private content belonging to the application producing it.

(Quotation) An inline portion of text attributed to someone other than the author of the surrounding text.

(Ruby base text) The full-size text to which the ruby annotation is applied.

(Ruby punctuation) Punctuation surrounding the ruby annotation text.

(Ruby annotation text) The smaller-size text that is placed adjacent to the ruby base text.

(PDF 1.5) A side-note (annotation) written in a smaller text size and placed adjacent to the base text to which it refers.

(Section) A container for grouping related content elements. For example, a section might contain a heading, several introductory paragraphs, and two or more other sections nested whithin it as subsections.

A generic inline portion of text having no particular inherent characteristics.

(Table body row group; PDF 1.5) A group of rows that constitute the main body portion of a table.

(Table data cell) A table cell containing data that is part of the table’s content.

(Table footer row group; PDF 1.5) A group of rows that constitute the footer of a table.

(Table header cell) A table cell containing header text describing one or more rows of the table.

(Table header row group; PDF 1.5) A group of rows that constitute the header of a table.

(Table row) A row of headings or data in a table.

A two-dimensional layout of rectangular data cells.

(Warichu punctuation) The punctuation that surrounds the WT text.

(Warichu text) The smaller-size text of a warichu comment that is formatted into two lines and placed between surrounding WP elements.

(PDF 1.5) A comment or annotation in a smaller text size and formatted onto two smaller lines within the height of the containing text line and placed following (inline) the base text to which it refers.