Add support for generating synthetic XSAnnotations.  When a schema component has non-schema attributes and no child attributes create a synthetic XSAnnotation (under feature control) so the non-schema attributes can be recovered under PSVI.


git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@176071 13f79535-47bb-0310-9956-ffa450edef68