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.
The Java XML implementation does so whenever the DTD makes it possible.
Although a full treatment of XML Schema is beyond the scope of this tutorial, this section shows you the steps you take to validate an XML document using an existing schema written in the XML Schema language.
To learn more about XML Schema, you can review the online tutorial, XML Schema Part 0: Primer, at
The second line specifies the schema to use for elements in the document that do not have a namespace prefix, namely for the elements that are typically defined in any simple, uncomplicated XML document.
Note - More information about namespaces is included in Validating with XML Schema in Document Object Model.
In addition to the error handling described in Setting up Error Handling, there is one error that can occur when configuring the parser for schema-based validation.
If the parser is not compliant with the JAXP spec, and therefore does not support XML Schema, it can throw a , which stands for XML Schema instance.
Fortunately, you can easily accomplish this in PHP.
This article shows you how to validate XML documents within PHP and determine the cause of validation failures.
Note - There are multiple schema-definition languages, including RELAX NG, Schematron, and the W3C "XML Schema" standard.