Integrating data in Cultural Heritage (CH) disciplines may inherited from multiple process or methodologies of digital document (DD) analysis wether the DD may contain text or images or other features associated with the document and/or the context of production of the document itself. Asserting historical authentification of informations contained or subsumed in a DD leads different disciplines to build methods that may include conceptual data modelling (see for example Bruseker & al, 2017). In the proposed approach, a DD-here a digital photograph of a technical drawing, is apprehended as an artefact (see for instance, DOLCE developpments by Kassel & al, 2009), a concept of the technical object both a) relational-the object defined by its relationships to the environment, and b) processual-the mode of existence of the technical object is defined by the concrete modalities of its genesis (Guchet, 2017).