How validating parsers use xml schema namespace
The prefix entity then needs to be defined or discovered in the instance document, so there is some burden beyond simply using namespaces correctly in your XML with this technique. There are many ways to declare namespaces for elements.
Relax NG and Schematron are two other validation methods worth being familiar with.
The XML Schema specification is divided into three parts.
The first part is called the primer and describes basic usage of XML Schema.
By convention, XML is serialized as a text document.
A parser is a piece of software which reads the document and handles the intricacies of the XML format for the programmer.
DOM, XSL and typical SAX processing all inherently rely on this guarantee of well-formed XML documents.