*/
public PDFAExtensionSchema(XMPMetadata metadata,
Map<String, String> namespaces) throws XmpSchemaException {
super(metadata, PDFAEXTENSION, PDFAEXTENSIONURI);
if (!namespaces.containsKey(PDFAEXTENSION)) {
throw new XmpSchemaException(
"Extension schema is declared without the pdfaSchema namespace specification");
}
namespaces.remove(PDFAEXTENSION);
for (Entry<String, String> entry : namespaces.entrySet()) {