Cleanup: investigate the use of deprecated SAX interfaces

The following SAX interfaces and classes were deprecated:
org.xml.sax.AttributeList
org.xml.sax.DocumentHandler
org.xml.sax.HandlerBase
org.xml.sax.Parser
org.xml.sax.helpers.AttributeListImpl
org.xml.sax.helpers.ParserFactory
org.xml.sax.helpers.XMLReaderFactory

There are still usages in the JAXP source, such as:
com/sun/org/apache/xalan/internal/xsltc/runtime/Attributes.java
com/sun/org/apache/xalan/internal/xsltc/trax/TrAXFilter.java
com/sun/org/apache/xalan/internal/xsltc/trax/Util.java
com/sun/org/apache/xerces/internal/jaxp/SAXParserImpl.java
com/sun/org/apache/xerces/internal/impl/xs/traversers/XSDHandler.java
com/sun/org/apache/xpath/internal/SourceTreeManager.java
javax/xml/parsers/SAXParser.java
org/xml/sax/helpers/ParserAdapter.java
org/xml/sax/helpers/XMLReaderAdapter.java


Investigate whether the usages can be removed or replaced.