CAD Drafting -- 10 Guidelines for Conforming with ISO 13567
CAD data sets are in default conformance with ISO 13567 when (1) the field names, field length, field definition and field order are as listed below and, (2) they are accompanied by the required layer naming system definition file. The U.S. NCS adheres to this standard.
In addition, ISO 13567 establishes rules for modifying the layer format itself, in the event that national standards bodies or specific projects may desire to do so. As long as these rules are followed, the CAD data set is considered to be in conceptual conformance with the ISO standard, which is an approved alternative to default conformance.