Java Reference
In-Depth Information
namespace-prefixes
decides whether a namespace declaration's
xmlns
and
xmlns:
prefix
attributes are included in the
Attributes
list passed to
startElement()
,andalsodecideswhetherqualifiednamesarepassedasthemeth-
od's third argument—a
qualified name
is a prefix plus a local name. It defaults to
false
,meaningthat
xmlns
and
xmlns:
prefix
arenotincluded,andthatparsers
don'thavetopassqualifiednames.Nopropertiesaremandatory.TheJDKdocument-
ation's
org.xml.sax
package page lists standard SAX 2 features and properties.
The
setProperty()
call assigns an instance of a class that implements the
org.xml.sax.ext.LexicalHandler
interface to the
lexical-handler
property so that interface methods can be called to report on comments, CDATA sec-
tions,andsoon.Propertynamesareprefixedwith
http://xml.org/sax/prop-
erties/
.
Note
Unlike
ContentHandler
,
DTDHandler
,
EntityResolver
, and
Er-
rorHandler
,
LexicalHandler
is an extension (it is not part of the core SAX
API), which is why
XMLReader
does not declare a
void setLexicalHand-
ler(LexicalHandler handler)
method.Ifyouwanttoinstallalexicalhand-
ler, you must use
XMLReader
's
setProperty()
method to install the handler
asthevalueofthe
http://xml.org/sax/properties/lexical-handler
property.
Featuresandpropertiescanberead-onlyorread-write.(Insomerarecases,afeature
orpropertymightbewrite-only.)Whensettingorreadingafeatureorproperty,eithera
SAXNotSupportedException
ora
SAXNotRecognizedException
instance
mightbethrown.Forexample,ifyoutrytomodifyaread-onlyfeature/property,anin-
stanceofthe
SAXNotSupportedException
classisthrown.Thisexceptioncould
alsobethrownifyoucall
setFeature()
or
setProperty()
duringparsing.Try-
ingtosetthevalidationfeatureforaparserthatdoesn'tperformvalidationisascenario
where an instance of the
SAXNotRecognizedException
class is thrown.
The handlers installed by
setContentHandler()
,
setDTDHandler()
, and
setErrorHandler()
, the entity resolver installed by
setEntityResolver()
,
and the handler installed by the
lexical-handler
property/
LexicalHandler
interfaceprovidevariouscallbackmethodsthatyouneedtounderstandbeforeyoucan
codifythemtorespondeffectivelytoparsingevents.
ContentHandler
declaresthe
following content-oriented informational callback methods:
