Introduction - If you have any usage issues, please Google them yourself
1, install and learn how to use integrated development environment XMLSPY complete XML-related development work.
2, familiar with and master the basic content of the XML specification, including XML declarations, comments, processing instructions, elements, attributes, CDATA sections, predefined entities, namespaces use, and how well-formed XML documents and validation flexibility hierarchical data using XML to represent various types of information.
3, learn how to declare elements and their content model in the DTD document, attributes, and entities declared and used the use of internal/external DTD rule on the validity of XML data document constraints.