Under his name two fragments are extant - the longer from his work on orthography (De orthographia), the shorter (chiefly on the use of prepositions) from another grammatical work.
The prepositions offer several points of comparison.
Sumerian has only postpositions instead of prepositions, which occur exclusively in Semitic. In this point also Sumerian is in accord with all other agglutinative idioms. Note Sumerian e-da, " in the house " (e, " house," +da, " in," by dissimilation), and compare Turkish ev, " house," de, " in," and evde, " in the house."
But the spelling then was very concise: it is possible that some of the slighter words, such as prepositions, were omitted in the writing, and were intended to be supplied from the context.
Case is known by the position of the noun in the sentence or by prepositions.