11.12. Tags

Tags are also stored on "Annotation" objects, and each tag consist of a key-value pair. The sequencer does two things depending upon what the key looks like. When the key is a simple string without a ':', then a property is created on the annotation's target object using this string as the property name and the tag's value as the property's value. More recently Teiid Designer has started to use tags with keys of the form "namespace:name", where "namespace" is really informal and can theoretically be any string value. While this format is the same as JCR property names, treating them as namespaced JCR property names would require there be a namespace URI registered with the prefix matching the "namespace" value.

The sequencer tries to parse the tag key as a property name, and if it works then the tag is added as a property just as mentioned earlier. However, if the namespace does not exist, then the sequencer splits the key into the two parts, where the first is used to identify a child node and the second is used as a property name.

For example, a tag on the "ID" column object under the "MyTable" base table:

foo="bar"

will be stored as a property "foo" with value "bar" on the "MyTable/ID" node. However, the

connection:driver-class="oracle.jdbc.OracleDriver"

tag on the same object would be stored as the "driver-class" property (with value "oracle.jdbc.OracleDriver") on the "MyTable/ID/connection" object.