Indicates the reason for the error. This element indicates that the document was not compliant to the schema after the requested operation was performed. This indicates that the request was supposed to contain a valid XML fragment body, but did not. This indicates that an attempt to insert an element, attribute or document failed because the document or element into which the insertion was supposed to occur does not exist Contains an HTTP URI that points to the element which is the closest ancestor that does exist. This indicates that the requested PUT operation could not be performed because a GET of that resource after the PUT would not yield the content of the PUT request. This indicates that the request was supposed to contain a valid XML attribute value, but did not. This indicates that the requested operation would result in a document that did not meet a uniqueness constraint defined by the application usage. For each URI, element or attribute specified by the client which is not unique, one of these is present. An optional set of alternate values can be provided. This indicates that the body of the request was not a well-formed document. This indicates that the requested operation would result in a document that failed a data constraint defined by the application usage, but not enforced by the schema or a uniqueness constraint. This indicates that the requested DELETE operation could not be performed because it would not be idempotent. This indicates that request could not be completed because it would have produced a document not encoded in UTF-8.