Don't tell mom I'm doing document analysis; she believes I'm in the computer vision field

Two kinds of knowledge can be distinguished in technical document interpretation: structural and syntactic knowledge, referring to the representation rules of objects, and semantic knowledge, referring to the objects themselves. It is shown how drawing analysis can be seen as a reading of the document in terms of discrete and non-discrete signs, the reading strategies being activated by specific symbols. An example of such a reading for a specific layer, annotations such as dimensioning, is presented.<>