# ControlledKeywordStandard
Keyword from a controlled vocabulary or ontology
Implementation of ControlledKeyword
# Properties
| Property | Definition | Type | Cardinality | ValueFrom |
|---|---|---|---|---|
| keyword | Keyword label | string | 1..1 | |
| keywordSchema | Name of the vocabulary or authority list | string | 0..1 | |
| keywordUrl | Concept identifier | string (format=url) | 1..1 |