A document type definition (DTD) is a set of markup declarations that define a document type for an SGML-family markup language (SGML, XML, HTML).
A Document Type Definition (DTD) defines the legal building blocks of an XML document.
The declarations in the internal subset form part of the DOCTYPE in the document itself.
The declarations in the external subset are located in a separate text file.
For validation to be possible, the XML document needs to be associated to a DTD or an XML schema. Up until this point, this lesson has concentrated on the non-validating parser.
This section examines the validating parser to find out what happens when you use it to parse the sample program.
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.
This is the reason why (most of the) XML parser implementations do not support XML Namespaces by default, to handle the validation of XML documents with namespaces correctly it is therefore necessary to configure the underlying parsers to provide support for XML Namespaces.
) as defined below has been used in the code examples to validate the input document.
In the following illustration, Stylus Studio®'s real-time syntax checking has reported an error with the element this element is not defined in its respective Document Type Definition, so it is highlighted in orange during editing, and it is reported in the output window at the time the XML is validated.
Any error messages resulting from a failed XML validation attempt are written to an error console.
Configure Java APIs (SAX, DOM, dom4j, XOM) using JAXP 1.3 to validate XML Documents with DTD and Schema(s).