Oracle XML parsing reads an XML document and uses DOM or SAX APIs to provide programmatic access to its content and structure.
You can use parsing in validating or nonvalidating mode.
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On the other hand, if you are writing an application that filters an XML data file and if you want to output an equally readable version of the file, then that white space would no longer be irrelevant: it would be essential.
To get those characters, you would add the This code simply generates a message to let you know that ignorable white space was seen. The SAX specification does not require that this method be invoked.
uses the non-validating parser by default, but it can also activate validation.
Activating validation allows the application to tell whether the XML document contains the right tags or whether those tags are in the right sequence.
You can access the JAXP specification, which is produced by Sun Microsystems, at the following URL: DOM Stream access to XML nodes is done by PL/SQL and Java APIs.