from yams.buildobjs import EntityType, String, SubjectRelation, RelationType

class Tag(EntityType):

    """tags are used by users to mark entities.

    When you include the Tag entity, all application specific entities

    may then be tagged using the "tags" relation.

    """

    name = String(required=True, fulltextindexed=True, unique=True,

                  maxsize=128)

    # when using this component, add the Tag tag X relation for each type that

    # should be taggeable

    tags = SubjectRelation('Tag', description="tagged objects")

class tags(RelationType):

    """indicates that an entity is classified by a given tag"""