Delta version must be s1.0 There must be a deltaxml:content-type attribute with the value 'simplified-merge-concurrent'. versionSet values may not be empty Only equal deltaxml:versionSet versions are allowed. The following versionSet versions must be instances of NMTOKEN: . Delta versions must not be repeated within a versionSet attribute Invalid version(s) detected for element at path : . VersionSet value contains duplicate versions for element at path : . Invalid ordering of versionSet version(s) between equalities '=' detected for element at path : equivalence class(es) ' have invalid version orderings. All elements representing version group (i.e. child of deltaxml:versionContentGroup) must contain at least two deltaxml:versionContent children. A versionContentGroup cannot contain anything other than deltaxml:versionContent elements. Version group should not have deltaxml:versionSet attribute. Version content group must have child elements specifying all the versions. All elements representing version attribute group (i.e. child of deltaxml:versionAttributeGroup) must contain at least two deltaxml:versionAttribute children. A versionAttributeGroup cannot contain anything other than deltaxml:versionAttribute elements. A deltaxml:versionAttributeGroup elements must appear just after its parent element. Only one deltaxml:versionAttributeGroup is allowed in an element. Version attribute group should not have deltaxml:versionSet attribute. Version attribute group must have child elements specifying all the versions. Every version content element should have a versionSet. A deltaxml:versionContent element must be a child of deltaxml:versionContentGroup. Each versionSet version should occur exactly once in consecutive deltaxml:versionContent elements. Every version attribute element should have a versionSet. Every version attribute element should be empty. Unchanged attributes should be on the elements. A deltaxml:versionAttribute element must be a child of deltaxml:versionAttributeGroup. Each versionSet version should occur exactly once in consecutive deltaxml:versionAttribute elements. The element at path having a versionSet value is neither deltaxml:versionContent nor deltaxml:versionAttribute.