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13. Structured Markup Processing Tools  
  
Python supports a variety of modules to work with various forms of
structured data markup.  This includes modules to work with the
Standard Generalized Markup Language (SGML) and the Hypertext Markup
Language (HTML), and several interfaces for working with the
Extensible Markup Language (XML).
  sgmllib Only as much of an SGML parser as needed to parse HTML. htmllib A parser for HTML documents. htmlentitydefs Definitions of HTML general entities. xml.parsers.expat An interface to the Expat non-validating XML parser. xml.dom Document Object Model API for Python. xml.dom.minidom Lightweight Document Object Model (DOM) implementation. xml.dom.pulldom Support for building partial DOM trees from SAX events. xml.sax Package containing SAX2 base classes and convenience
                functions. xml.sax.handler Base classes for SAX event handlers. xml.sax.saxutils Convenience functions and classes for use with SAX. xml.sax.xmlreader Interface which SAX-compliant XML parsers must implement. xmllib A parser for XML documents. 
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