XML schema
For documents that are associated with an XML schema, Oxygen XML offers tag completion. Oxygen XML can use a number of XML schema languages, including DTD, W3C XML Schema, RELAX NG (both compact and full). Both W3C XML Schema and RELAX NG schemas can include embedded Schematron rules. It also can use the NRL and NVDL routing languages, which allow multiple schemas of different types to be applied to different files.