Supported Key Types
All supported metadata keys conform to a type.
User-defined metadata keys conform also to a type, based on the suffix of the key.
| Suffix | Type |
| -number | Number |
| -role | Word |
| -set | WordSet |
| -title | Zettelmarkup |
| -url | URL |
| -zettel | Identifier |
| -zid | Identifier |
| -zids | IdentifierSet |
| any other suffix | EString |
The name of the metadata key is bound to the key type
Every key type has an associated validation rule to check values of the given type. There is also a rule how values are matched, e.g. against a search term when selecting some zettel. And there is a rule how values compare for sorting.