ODM2 Annotation Type Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of annotation. In ODM2 the annotation type determines whether the annotation forms a grouping of related entities (e.g., a group of sites or variables) or an annotation of a particular entity (e.g., a comment about an individual Site or data value). Site group A group of sites such as a transect, station, observatory, monitoring collection, etc. Group