19. 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).

It is important to note that modules in the "xml" package require that
there be at least one SAX-compliant XML parser available. Starting
with Python 2.3, the Expat parser is included with Python, so the
"xml.parsers.expat" module will always be available. You may still
want to be aware of the PyXML add-on package; that package provides an
extended set of XML libraries for Python.

The documentation for the "xml.dom" and "xml.sax" packages are the
definition of the Python bindings for the DOM and SAX interfaces.

* 19.1. "HTMLParser" — Simple HTML and XHTML parser

  * 19.1.1. Example HTML Parser Application

  * 19.1.2. "HTMLParser" Methods

  * 19.1.3. Examples

* 19.2. "sgmllib" — Simple SGML parser

* 19.3. "htmllib" — A parser for HTML documents

  * 19.3.1. HTMLParser Objects

* 19.4. "htmlentitydefs" — Definitions of HTML general entities

* 19.5. XML Processing Modules

* 19.6. XML vulnerabilities

  * 19.6.1. defused packages

* 19.7. "xml.etree.ElementTree" — The ElementTree XML API

  * 19.7.1. 教程

    * 19.7.1.1. XML tree and elements

    * 19.7.1.2. Parsing XML

    * 19.7.1.3. Finding interesting elements

    * 19.7.1.4. Modifying an XML File

    * 19.7.1.5. Building XML documents

    * 19.7.1.6. Parsing XML with Namespaces

    * 19.7.1.7. Additional resources

  * 19.7.2. XPath support

    * 19.7.2.1. 示例

    * 19.7.2.2. Supported XPath syntax

  * 19.7.3. 参考引用

    * 19.7.3.1. Functions

    * 19.7.3.2. Element Objects

    * 19.7.3.3. ElementTree Objects

    * 19.7.3.4. QName Objects

    * 19.7.3.5. TreeBuilder Objects

    * 19.7.3.6. XMLParser Objects

* 19.8. "xml.dom" — The Document Object Model API

  * 19.8.1. 模块内容

  * 19.8.2. Objects in the DOM

    * 19.8.2.1. DOMImplementation Objects

    * 19.8.2.2. Node Objects

    * 19.8.2.3. NodeList Objects

    * 19.8.2.4. DocumentType Objects

    * 19.8.2.5. Document Objects

    * 19.8.2.6. Element Objects

    * 19.8.2.7. Attr Objects

    * 19.8.2.8. NamedNodeMap Objects

    * 19.8.2.9. Comment Objects

    * 19.8.2.10. Text and CDATASection Objects

    * 19.8.2.11. ProcessingInstruction Objects

    * 19.8.2.12. 异常

  * 19.8.3. Conformance

    * 19.8.3.1. Type Mapping

    * 19.8.3.2. Accessor Methods

* 19.9. "xml.dom.minidom" — Minimal DOM implementation

  * 19.9.1. DOM Objects

  * 19.9.2. DOM Example

  * 19.9.3. minidom and the DOM standard

* 19.10. "xml.dom.pulldom" — Support for building partial DOM trees

  * 19.10.1. DOMEventStream Objects

* 19.11. "xml.sax" — Support for SAX2 parsers

  * 19.11.1. SAXException Objects

* 19.12. "xml.sax.handler" — Base classes for SAX handlers

  * 19.12.1. ContentHandler Objects

  * 19.12.2. DTDHandler Objects

  * 19.12.3. EntityResolver Objects

  * 19.12.4. ErrorHandler Objects

* 19.13. "xml.sax.saxutils" — SAX Utilities

* 19.14. "xml.sax.xmlreader" — Interface for XML parsers

  * 19.14.1. XMLReader Objects

  * 19.14.2. IncrementalParser Objects

  * 19.14.3. Locator Objects

  * 19.14.4. InputSource Objects

  * 19.14.5. The "Attributes" Interface

  * 19.14.6. The "AttributesNS" Interface

* 19.15. "xml.parsers.expat" — Fast XML parsing using Expat

  * 19.15.1. XMLParser Objects

  * 19.15.2. ExpatError Exceptions

  * 19.15.3. 示例

  * 19.15.4. Content Model Descriptions

  * 19.15.5. Expat error constants
