There must be a deltaxml:version-order attribute There must be a deltaxml:content-type attribute with the value 'merge-concurrent' Delta values may not be empty The following deltaV2 versions must be instances of NMTOKEN: . Delta versions must not be repeated within a deltaV2 attribute Invalid deltaV2 version(s) detected for element at path : . DeltaV2 value contains duplicate versions for element at path : . Invalid ordering of deltaV2 version between inequalities '!=' detected for element at path : versions '' are in the wrong order. Invalid ordering of deltaV2 version(s) between equalities '=' detected for element at path : equivalence class(es) ' have invalid version orderings. All ancestors of an element with a delta attribute should also have delta attributes Every version in the delta value should be present in the delta value of all ancestor elements. The element at path has a deltaV2 value when its parent does not. The element at path has a deltaV2 value that has version(s) that the parent does not. The element at has a deltaV2 value that is inconsistent with its parent. The element at path has an invalid deltaV2 with respect to the child deltas. The deltaV2 value is and should be .