St.Laurent's popular primer offers Web developers a quick start to understanding and implementing XML. This third edition of XML: A Primer, 3rd Edition, includes new developments in XML technology regarding XLink, XPointer, XPath and XSLT. This guide for Web developers explains the differences and similarities between SGML, HTML, and XML, and provides you with a solid understanding of how to create custom tags and Document Type Definitions (DTDs). You'll also find discussion on the impact of XML Schemas and RELAX.