Tags and entities are markup characters of an XML document. A namespace is a set of unique identifiers. The elements contained within the parent element are known as child elements . An XML parser is a processor that reads an XML document and determines the structure and properties of the data. The root element is also called the document element .
Tags are text structures that mark the beginning and end of elements within the XML document.
Tags are markup characters. Unicode standards are sychronized with UCS-2 subset of ISO 10646. Extensible Markup Language. The XML subset of SGML has been specifically designed to function on the Web. SMIL, WIDL, MathML, and ICE are all examples of XML vocabularies.