Optionaldocument: DesignDocumentOptionaldocuments: DesignDocument[]The document: a part document with its parameters, features and parts, or an assembly
document with its components.
OptionaldocumentsThe documents an assembly's components place, each with the id they name it by; their
problems are listed under their position, such as /documents/2.
A design document, with the documents an assembly places, for
design.validate, which checks them without building anything.