Related Data Formats

SGML

• Standard Generalized Markup Language
• XML is a simplified subset of SGML
  

HTML

• HyperText Markup Language
• Specifies how to display data
• Does not specify how to identify the data

XHTML

• Extensible HyperText Markup Language
• A reformulation of HTML in XML
• Compatible with older web browsers
• XHTML is an XML language