XML
允许作者自行创建标记，以便精确描述数据，各个学术领域的人和组织创建了大量XML词汇表来结构化数据。其中一些词汇表包括MathXML（数学标记语
言）、可扩展矢量图形（SVG）、无线标记语言（WML）、可扩展商业报表语言（XBRL）、可扩展用户界面语言（XUL）、以及VoiceXML。
Schema和XSL（可扩展样式表语言）也都是XML语汇表的例子。
# open XML document that contains the forum names and locations try: XMLFile = open( "../htdocs/XML/forums.xml" ) except IOError: print "Location: /error.html\n" sys.exit()
# parse XML document containing forum information reader = PyExpat.Reader() document = reader.fromStream( XMLFile ) XMLFile.close()
# write XHTML to browser printHeader( "my Forum", "/XML/site.css" ) print """
my Forum
Available Forum
"""
# determine client-browser type if os.environ[ "HTTP_USER_AGENT"].find( "MSIE" ) != -1: prefix = "../XML/" else: prefix = "forum.py?file="
# add links for each forum for forum in document.getElementsByTagName( "forum" ):
#create link to forum link = prefix + forum.attributes.item( 0 ).value
#get element nodes containing tag name "name" name = forum.getElementsByTagName( "name" )[ 0 ]
#get Text node's value nameText = name.childNodes[ 0 ].nodeValue print '
#add new forum element forum = document.createElement( "forum" ) forum.setAttribute( "filename", newFile )
name = document.createElement( "name" ) nameText = document.createTextNode( form[ "name" ].value ) name.appendChild( nameText ) forum.appendChild( name )
# obtain root element of forum documentNode = document.documentElement firstForum = documentNode.getElementsByTagName( "forum" )[ 0 ] documentNode.insertBefore( forum, firstForum )
# write update XML to disk forumsFile.seek(0, 0) forumsFile.truncate() PrettyPrint( document, forumsFile ) forumsFile.close()
# create document for new forum from template file document = reader.fromStream( templateFile ) forum = document.documentElement forum.setAttribute( "file", newFile )
# create name element name = document.createElement( "name" ) nameText = document.createTextNode( form[ "name" ].value ) name.appendChild( nameText ) forum.appendChild( name )
# write generated XML to new forum file PrettyPrint( document, newForumFile ) newForumFile.close() templateFile.close() reader.releaseNode( document )
print "Location: default.py\n"
else: printHeader( "Add a forum", "/XML/site.css" ) print """
# add elements to message messageElements = [ "user", "title", "text" ]
for item in messageElements:
if not form.has_key( item ): text = "( Field left blank )" else: text = form[ item ].value
# create nodes element = document.createElement( item ) elementText = document.createTextNode( text ) element.appendChild( elementText ) message.appendChild( element )
#append new message to forum and update document on disk documentNode.appendChild( message ) forumFile.seek(0,0) forumFile.truncate() PrettyPrint( document, forumFile ) forumFile.close() reader.releaseNode( document )
