R320

R320 / 1:M

Frame Metadata must appear in one or many Field

Field must show exactly one Frame Metadata

---

If an item of Metadata is included in a Frame, it must appear in at least one Field. At most, it can appear in two, one of each type, Boxed and Open. The reasoning is that there shouldn’t be any need to duplicate frame data in multiple locations inside or outside of a title block. But it can be helpful to take some piece of data that appears in a title block and present it outside for emphasis. The specific case motivating this rule is the diagram Title Metadata item. Even though the title information could be included in the title block, it is often nice to show it in the upper left corner of the sheet also for quick reference.