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+" Vim syntax file
+" Language:	XML
+" Maintainer:	Johannes Zellner <johannes@zellner.org>
+"		Author and previous maintainer:
+"		Paul Siegmann <pauls@euronet.nl>
+" Last Change:	Fri, 04 Jun 2004 10:41:54 CEST
+" Filenames:	*.xml
+" $Id$
+
+" CONFIGURATION:
+"   syntax folding can be turned on by
+"
+"      let g:xml_syntax_folding = 1
+"
+"   before the syntax file gets loaded (e.g. in ~/.vimrc).
+"   This might slow down syntax highlighting significantly,
+"   especially for large files.
+"
+" CREDITS:
+"   The original version was derived by Paul Siegmann from
+"   Claudio Fleiner's html.vim.
+"
+" REFERENCES:
+"   [1] http://www.w3.org/TR/2000/REC-xml-20001006
+"   [2] http://www.w3.org/XML/1998/06/xmlspec-report-19980910.htm
+"
+"   as <hirauchi@kiwi.ne.jp> pointed out according to reference [1]
+"
+"   2.3 Common Syntactic Constructs
+"   [4]    NameChar    ::=    Letter | Digit | '.' | '-' | '_' | ':' | CombiningChar | Extender
+"   [5]    Name        ::=    (Letter | '_' | ':') (NameChar)*
+"
+" NOTE:
+"   1) empty tag delimiters "/>" inside attribute values (strings)
+"      confuse syntax highlighting.
+"   2) for large files, folding can be pretty slow, especially when
+"      loading a file the first time and viewoptions contains 'folds'
+"      so that folds of previous sessions are applied.
+"      Don't use 'foldmethod=syntax' in this case.
+
+
+" Quit when a syntax file was already loaded
+if exists("b:current_syntax")
+    finish
+endif
+
+let s:xml_cpo_save = &cpo
+set cpo&vim
+
+syn case match
+
+" mark illegal characters
+syn match xmlError "[<&]"
+
+" strings (inside tags) aka VALUES
+"
+" EXAMPLE:
+"
+" <tag foo.attribute = "value">
+"                      ^^^^^^^
+syn region  xmlString contained start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=xmlEntity display
+syn region  xmlString contained start=+'+ skip=+\\\\\|\\'+ end=+'+ contains=xmlEntity display
+
+
+" punctuation (within attributes) e.g. <tag xml:foo.attribute ...>
+"                                              ^   ^
+" syn match   xmlAttribPunct +[-:._]+ contained display
+syn match   xmlAttribPunct +[:.]+ contained display
+
+" no highlighting for xmlEqual (xmlEqual has no highlighting group)
+syn match   xmlEqual +=+ display
+
+
+" attribute, everything before the '='
+"
+" PROVIDES: @xmlAttribHook
+"
+" EXAMPLE:
+"
+" <tag foo.attribute = "value">
+"      ^^^^^^^^^^^^^
+"
+syn match   xmlAttrib
+    \ +[-'"<]\@<!\<[a-zA-Z:_][-.0-9a-zA-Z0-9:_]*\>\(['">]\@!\|$\)+
+    \ contained
+    \ contains=xmlAttribPunct,@xmlAttribHook
+    \ display
+
+
+" namespace spec
+"
+" PROVIDES: @xmlNamespaceHook
+"
+" EXAMPLE:
+"
+" <xsl:for-each select = "lola">
+"  ^^^
+"
+if exists("g:xml_namespace_transparent")
+syn match   xmlNamespace
+    \ +\(<\|</\)\@<=[^ /!?<>"':]\+[:]\@=+
+    \ contained
+    \ contains=@xmlNamespaceHook
+    \ transparent
+    \ display
+else
+syn match   xmlNamespace
+    \ +\(<\|</\)\@<=[^ /!?<>"':]\+[:]\@=+
+    \ contained
+    \ contains=@xmlNamespaceHook
+    \ display
+endif
+
+
+" tag name
+"
+" PROVIDES: @xmlTagHook
+"
+" EXAMPLE:
+"
+" <tag foo.attribute = "value">
+"  ^^^
+"
+syn match   xmlTagName
+    \ +[<]\@<=[^ /!?<>"']\++
+    \ contained
+    \ contains=xmlNamespace,xmlAttribPunct,@xmlTagHook
+    \ display
+
+
+if exists('g:xml_syntax_folding')
+
+    " start tag
+    " use matchgroup=xmlTag to skip over the leading '<'
+    "
+    " PROVIDES: @xmlStartTagHook
+    "
+    " EXAMPLE:
+    "
+    " <tag id="whoops">
+    " s^^^^^^^^^^^^^^^e
+    "
+    syn region   xmlTag
+	\ matchgroup=xmlTag start=+<[^ /!?<>"']\@=+
+	\ matchgroup=xmlTag end=+>+
+	\ contained
+	\ contains=xmlError,xmlTagName,xmlAttrib,xmlEqual,xmlString,@xmlStartTagHook
+
+
+    " highlight the end tag
+    "
+    " PROVIDES: @xmlTagHook
+    " (should we provide a separate @xmlEndTagHook ?)
+    "
+    " EXAMPLE:
+    "
+    " </tag>
+    " ^^^^^^
+    "
+    syn match   xmlEndTag
+	\ +</[^ /!?<>"']\+>+
+	\ contained
+	\ contains=xmlNamespace,xmlAttribPunct,@xmlTagHook
+
+
+    " tag elements with syntax-folding.
+    " NOTE: NO HIGHLIGHTING -- highlighting is done by contained elements
+    "
+    " PROVIDES: @xmlRegionHook
+    "
+    " EXAMPLE:
+    "
+    " <tag id="whoops">
+    "   <!-- comment -->
+    "   <another.tag></another.tag>
+    "   <empty.tag/>
+    "   some data
+    " </tag>
+    "
+    syn region   xmlRegion
+	\ start=+<\z([^ /!?<>"']\+\)+
+	\ skip=+<!--\_.\{-}-->+
+	\ end=+</\z1\_\s\{-}>+
+	\ matchgroup=xmlEndTag end=+/>+
+	\ fold
+	\ contains=xmlTag,xmlEndTag,xmlCdata,xmlRegion,xmlComment,xmlEntity,xmlProcessing,@xmlRegionHook
+	\ keepend
+	\ extend
+
+else
+
+    " no syntax folding:
+    " - contained attribute removed
+    " - xmlRegion not defined
+    "
+    syn region   xmlTag
+	\ matchgroup=xmlTag start=+<[^ /!?<>"']\@=+
+	\ matchgroup=xmlTag end=+>+
+	\ contains=xmlError,xmlTagName,xmlAttrib,xmlEqual,xmlString,@xmlStartTagHook
+
+    syn match   xmlEndTag
+	\ +</[^ /!?<>"']\+>+
+	\ contains=xmlNamespace,xmlAttribPunct,@xmlTagHook
+
+endif
+
+
+" &entities; compare with dtd
+syn match   xmlEntity                 "&[^; \t]*;" contains=xmlEntityPunct
+syn match   xmlEntityPunct  contained "[&.;]"
+
+if exists('g:xml_syntax_folding')
+
+    " The real comments (this implements the comments as defined by xml,
+    " but not all xml pages actually conform to it. Errors are flagged.
+    syn region  xmlComment
+	\ start=+<!+
+	\ end=+>+
+	\ contains=xmlCommentPart,xmlCommentError
+	\ extend
+	\ fold
+
+else
+
+    " no syntax folding:
+    " - fold attribute removed
+    "
+    syn region  xmlComment
+	\ start=+<!+
+	\ end=+>+
+	\ contains=xmlCommentPart,xmlCommentError
+	\ extend
+
+endif
+
+syn keyword xmlTodo         contained TODO FIXME XXX display
+syn match   xmlCommentError contained "[^><!]"
+syn region  xmlCommentPart
+    \ start=+--+
+    \ end=+--+
+    \ contained
+    \ contains=xmlTodo,@xmlCommentHook
+
+
+" CData sections
+"
+" PROVIDES: @xmlCdataHook
+"
+syn region    xmlCdata
+    \ start=+<!\[CDATA\[+
+    \ end=+]]>+
+    \ contains=xmlCdataStart,xmlCdataEnd,@xmlCdataHook
+    \ keepend
+    \ extend
+
+" using the following line instead leads to corrupt folding at CDATA regions
+" syn match    xmlCdata      +<!\[CDATA\[\_.\{-}]]>+  contains=xmlCdataStart,xmlCdataEnd,@xmlCdataHook
+syn match    xmlCdataStart +<!\[CDATA\[+  contained contains=xmlCdataCdata
+syn keyword  xmlCdataCdata CDATA          contained
+syn match    xmlCdataEnd   +]]>+          contained
+
+
+" Processing instructions
+" This allows "?>" inside strings -- good idea?
+syn region  xmlProcessing matchgroup=xmlProcessingDelim start="<?" end="?>" contains=xmlAttrib,xmlEqual,xmlString
+
+
+if exists('g:xml_syntax_folding')
+
+    " DTD -- we use dtd.vim here
+    syn region  xmlDocType matchgroup=xmlDocTypeDecl
+	\ start="<!DOCTYPE"he=s+2,rs=s+2 end=">"
+	\ fold
+	\ contains=xmlDocTypeKeyword,xmlInlineDTD,xmlString
+else
+
+    " no syntax folding:
+    " - fold attribute removed
+    "
+    syn region  xmlDocType matchgroup=xmlDocTypeDecl
+	\ start="<!DOCTYPE"he=s+2,rs=s+2 end=">"
+	\ contains=xmlDocTypeKeyword,xmlInlineDTD,xmlString
+
+endif
+
+syn keyword xmlDocTypeKeyword contained DOCTYPE PUBLIC SYSTEM
+syn region  xmlInlineDTD contained matchgroup=xmlDocTypeDecl start="\[" end="]" contains=@xmlDTD
+syn include @xmlDTD <sfile>:p:h/dtd.vim
+unlet b:current_syntax
+
+
+" synchronizing
+" TODO !!! to be improved !!!
+
+syn sync match xmlSyncDT grouphere  xmlDocType +\_.\(<!DOCTYPE\)\@=+
+" syn sync match xmlSyncDT groupthere  NONE       +]>+
+
+if exists('g:xml_syntax_folding')
+    syn sync match xmlSync grouphere   xmlRegion  +\_.\(<[^ /!?<>"']\+\)\@=+
+    " syn sync match xmlSync grouphere  xmlRegion "<[^ /!?<>"']*>"
+    syn sync match xmlSync groupthere  xmlRegion  +</[^ /!?<>"']\+>+
+endif
+
+syn sync minlines=100
+
+
+" The default highlighting.
+hi def link xmlTodo		Todo
+hi def link xmlTag		Function
+hi def link xmlTagName		Function
+hi def link xmlEndTag		Identifier
+if !exists("g:xml_namespace_transparent")
+    hi def link xmlNamespace	Tag
+endif
+hi def link xmlEntity		Statement
+hi def link xmlEntityPunct	Type
+
+hi def link xmlAttribPunct	Comment
+hi def link xmlAttrib		Type
+
+hi def link xmlString		String
+hi def link xmlComment		Comment
+hi def link xmlCommentPart	Comment
+hi def link xmlCommentError	Error
+hi def link xmlError		Error
+
+hi def link xmlProcessingDelim	Comment
+hi def link xmlProcessing	Type
+
+hi def link xmlCdata		String
+hi def link xmlCdataCdata	Statement
+hi def link xmlCdataStart	Type
+hi def link xmlCdataEnd		Type
+
+hi def link xmlDocTypeDecl	Function
+hi def link xmlDocTypeKeyword	Statement
+hi def link xmlInlineDTD	Function
+
+let b:current_syntax = "xml"
+
+let &cpo = s:xml_cpo_save
+unlet s:xml_cpo_save
+
+" vim: ts=8