Question about another learning element

This time it is the element lomLearningResourceType: http://docs.oasis-open.org/dita/v1.2/os/spec/langref/lomInteractivityType.html According to the specification, these are the legal values for the @value attribute: (Exercise Simulation Questionnaire Diagram Figure Graph Index Slide Table Narrative Text Exam Experiment ProblemStatement SelfAssesment, -dita-use-conref-target) In the DTD/XSD implementation, the values are: exercise, simulation, questionnaire, diagram, figure, graph, index, slide, table, narrativetext, exam, experiment, problemstatement, selfassessment, lecture, or -dita-use-conref-target Apart from the case issues and one word / two word issues, the DTD and XSD have a value of "lecture" that is not valid according to the spec.
So the question is - do we add the value "lecture" to the specification as a valid value, or do we list it in the specification as an errata in the DTD/XSD?
Robert D Anderson IBM Authoring Tools Development Chief Architect, DITA Open Toolkit ( http://dita-ot.sourceforge.net/ )