Version 6.1 (build 2005071905) of <oXygen/> appears to have broken validation. The attachment contains some files from NIST, one of which - ios-sample-1.0.xccdf.xml - has been slightly modified from the original (original files are available from http://csrc.nist.gov/checklists/xccdf.html). This file validates successfully in <oXygen/> v6.0, but not with <oXygen/> v6.1. v6.1 posts the following errors, which appear to be spurious: SystemID: null Location: 88:47 Description: E sch-props-correct.2: A schema cannot contain two global components with the same name; this schema contains two occurrences of 'http://www.w3.org/XML/1998/namespace,lang'. URL: http://www.w3.org/TR/xmlschema-1/#sch-props-correct SystemID: null Location: 95:48 Description: E sch-props-correct.2: A schema cannot contain two global components with the same name; this schema contains two occurrences of 'http://www.w3.org/XML/1998/namespace,space'. URL: http://www.w3.org/TR/xmlschema-1/#sch-props-correct SystemID: null Location: 104:45 Description: E sch-props-correct.2: A schema cannot contain two global components with the same name; this schema contains two occurrences of 'http://www.w3.org/XML/1998/namespace,base'. URL: http://www.w3.org/TR/xmlschema-1/#sch-props-correct SystemID: null Location: 111:41 Description: E sch-props-correct.2: A schema cannot contain two global components with the same name; this schema contains two occurrences of 'http://www.w3.org/XML/1998/namespace,specialAttrs'. URL: http://www.w3.org/TR/xmlschema-1/#sch-props-correct