ID	Type	Status	Priority	Milestone	Owner		Summary + Labels	...
	13	Defect	New	Medium	----	----		identifier elements do not require id attributes
	14	Defect	New	Medium	----	----		fragment identifiers in dtbook documents are reported as undefined
	15	Defect	New	Medium	----	----		external URIs in dtbook documents give incorrect warnings
	16	Defect	New	Medium	----	----		epubcheck does not check anything about DRM