The sole purpose of the <body> of a class 1 file is to contain a segmented transcription of a single version of a single work from a scriptum. <body> may take @in-progress and must take @xml:lang that the majority of the text is in. If a change in language occurs in a descendant <div>, ensure that its @xml:lang value (explicity or by inheritance) indicates the language that is used.

<body> takes one or more <div> elements, each of which govern either other <div> elements, or text (or TEI elements).

The term leaf div refers to those <div>s that contain text and therefore no other <div>s.

Within this treelike structure of <div>s, the concatenation of @n values, starting from the most ancestral <div>, provides the flat ref, the reference system used by class 2 files to refer to parts of TAN-T(EI) files.

One of the most important validation rules is the Leaf Div Uniqueness Rule, which states that the flat ref for each leaf <div> must be unique.

This rule applies only to leaf <div>s and not to <div>s in general, since on occasion a major textual unit will be broken by another. For example, chapters 24 and 30 in the book of Proverbs of the Septuagint are split and interleaved (24.1–22e [22a–e are verses not extant in the Hebrew]; 30.1–14; 24.23–34; and 30.15–33).