Architectural drawing and architectural graphic expression (EGA) are well defined and known disciplines. But there are forms of architectural expression (such as photography or diagrams), which are not necessarily "drawings". In the last three decades, digital technology has offered architecture multiple forms of expression (digital photography, vector models, CAD), and has proposed multiple forms of structuring and organizing data (data modeling techniques, associative data models, database systems, etc.). The arrival of these data technologies to graphic expression requires the need to look at architecture from the point of view of data.