package edu.stanford.db.xml.util;public class QName {  String namespace;  String localName;    public QName(String ns, String ln) {    namespace = ns;    localName = ln;  }    public QName(String ln) {    namespace = null;    localName = ln;  }    public int hashCode() {    return getName().hashCode();  }  public String getName() {    return namespace == null ? localName : namespace + localName;  }  public String toString() {    return getName();  }    public String getNamespace() {    return namespace;  }  public String getLocalName() {        return localName;  }  public boolean equals (Object that) {        if (this == that) {      return true;    }    if (that == null) {      return false;    }    if(that instanceof QName) {      QName t = (QName)that;            // resources are equal iff this.getURI() == that.getURI()      // the case distinction below is for optimization only to avoid unnecessary string concatenation            boolean b;            if(namespace == null) {	if(t.getNamespace() == null)	  b = localName.equals(t.getLocalName());	else // maybe "that" did not detect names	  b = localName.equals(t.getName());      } else {	if(t.getNamespace() != null)	  b = localName.equals(t.getLocalName()) && namespace.equals(t.getNamespace());	else // maybe "this" did not detect names	  b = getName().equals(t.getName());      }      return b;    } else      return getName().equals(String.valueOf(that));  }  }