Java and XML - Beginning Java - page 1265

Directory "TrySAXHandler 2 with extra callback methods"
I saved this as AddressNamespace1.xml . Unfortunately, you also have to update the DTD. Otherwise, if
the qualified names are not declared in the DTD, they are regarded as errors. You need to change the DTD
to the following:
<!ELEMENT addresses:address (addresses:buildingnumber, addresses:street,
addresses:city, addresses:state, addresses:zip)>
<!ATTLIST addresses:address xmlns:addresses CDATA #IMPLIED>
<!ELEMENT addresses:buildingnumber (#PCDATA)>
<!ELEMENT addresses:street (#PCDATA)>
<!ELEMENT addresses:city (#PCDATA)>
<!ELEMENT addresses:state (#PCDATA)>
<!ELEMENT addresses:zip (#PCDATA)>
Directory "TrySAXHandler 2 with extra callback methods"
I saved this as AddressNamespaceDoc1.dtd . The namespace prefix is addresses , and each element
name is qualified by the namespace prefix. You can usefully add implementations for two further callback
methods in the MySAXHandler class:
@Override
public void startPrefixMapping(String prefix, String uri) {
System.out.println(
"Start \"" + prefix + "\" namespace scope. URI: " + uri);
}
@Override
public void endPrefixMapping(String prefix) {
System.out.println("End \"" + prefix + "\" namespace scope.");
}
Directory "TrySAXHandler 2 with extra callback methods"
The parser doesn't call these methods by default. You have to switch the http://xml.org/sax/features/
namespace-prefixes feature on to get this to happen. You can add a call to the setFeature() method for
the parser factory object to do this in the process() method that you defined in the TrySAXHandler class,
immediately before you create the parser object in the try block:
spf.setFeature("http://xml.org/sax/features/namespace-prefixes",true);
parser = spf.newSAXParser();