*/
public void init() {
stack = new Stack<SchemaKey>();
unresolvedTypes = new HashMap<QName, List<TypeReceiver>>();
extReg = new ExtensionRegistry();
knownNamespaceMap = new HashMap<String, XmlSchema>();
schemaResolver = new DefaultURIResolver();
schemas = new HashMap<SchemaKey, XmlSchema>();
// LAST, since the ctor for XmlSchema will reach back into here.
xsd = new XmlSchema(XmlSchema.SCHEMA_NS, this);