Additional source of information. For instance: approval document, drawing, sketches, photographs, calculations, d&#233;rogation (Fr). This should be enriched at the national level with types according to document types such as as-built validation document, etc. The attachment inherits an id from BaseObject. This id identifies the attachment file stored in the media-folder inside the <a href="$diagram://{F896D657-7B98-4830-86A1-248F4AE2B1BB}"><font color="#0000ff"><u>zipped archive</u></font></a> in case of file-based delivery. Do not use as a convenience class for storing information covered by existing classes and attributes.