These two fields specify that values from one AttrSpec refer to values from another AttrSpec elsewhere on the page; validator will verify the references are not "dangling". These references may appear before or after their referents. For example, in the "id" AttrSpec in the "template" TagSpec, we h
| 37 | // value_oneof_set: TEMPLATE_IDS |
| 38 | // NEXT AVAILABLE TAG: 3 |
| 39 | type AttrSpec_ValueSet int32 |
| 40 | |
| 41 | const ( |
| 42 | AttrSpec_UNKNOWN_VALUESET AttrSpec_ValueSet = 0 // Never used |