Perspectives, exploded views, sections and cross-sections and details on a different scale are all considered to be drawings. So too are flow sheets and diagrams, such as functional diagrams and graphic representations of a given phenomenon which express the relationship between two or more parameters.
PCT AG I 5.129
Where tables or chemical or mathematical formulae are included in the description, claims or abstract, they are not considered to be drawings and are thus not subject to the requirements for drawings. However, such graphic forms may be submitted as drawings, in which case they are.
Where such graphic forms of presentation are not submitted as drawings, see GL/PCT‑EPO A‑V, 11.
PCT AG I 5.130- 5.133