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>Text.XML.HXT.XPath.XPathEval</TITLE
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>hxt-8.3.2: A collection of tools for processing XML with Haskell.</TD
><TD CLASS="topbut"
><A HREF="index.html"
>Contents</A
></TD
><TD CLASS="topbut"
><A HREF="doc-index.html"
>Index</A
></TD
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><FONT SIZE="6"
>Text.XML.HXT.XPath.XPathEval</FONT
></TD
><TD ALIGN="right"
><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>portable</TD
></TR
><TR
><TD CLASS="infohead"
>Stability</TD
><TD CLASS="infoval"
>experimental</TD
></TR
><TR
><TD CLASS="infohead"
>Maintainer</TD
><TD CLASS="infoval"
>Uwe Schmidt (uwe@fh-wedel.de)</TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Description</TD
></TR
><TR
><TD CLASS="doc"
><P
>Version    : $Id: XPathEval.hs,v 1.8 2006<EM
>10</EM
>12 11:51:29 hxml Exp $
</P
><P
>The core functions for evaluating the different types of XPath expressions.
   Each <TT
><A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AExpr"
>Expr</A
></TT
>-constructor is mapped to an evaluation function.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Synopsis</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetXPath"
>getXPath</A
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTrees"
>XmlTrees</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetXPathWithNsEnv"
>getXPathWithNsEnv</A
> :: <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AAttributes"
>Attributes</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTrees"
>XmlTrees</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetXPathSubTrees"
>getXPathSubTrees</A
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTrees"
>XmlTrees</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetXPathSubTreesWithNsEnv"
>getXPathSubTreesWithNsEnv</A
> :: <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AAttributes"
>Attributes</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTrees"
>XmlTrees</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetXPathNodeSet"
>getXPathNodeSet</A
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlNodeSet"
>XmlNodeSet</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetXPathNodeSetWithNsEnv"
>getXPathNodeSetWithNsEnv</A
> :: <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AAttributes"
>Attributes</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlNodeSet"
>XmlNodeSet</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AevalExpr"
>evalExpr</A
> :: <A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AEnv"
>Env</A
> -&gt; <A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AContext"
>Context</A
> -&gt; <A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AExpr"
>Expr</A
> -&gt; <A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AXPathFilter"
>XPathFilter</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Documentation</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getXPath"
><A NAME="v%3AgetXPath"
></A
></A
><B
>getXPath</B
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTrees"
>XmlTrees</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Select parts of a document by an XPath expression.
</P
><P
>The main filter for selecting parts of a document via XPath.
 The string argument must be a XPath expression with an absolute location path,
 the argument tree must be a complete document tree.
 Result is a possibly empty list of XmlTrees forming the set of selected XPath values.
 XPath values other than XmlTrees (numbers, attributes, tagnames, ...)
 are convertet to text nodes.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getXPathWithNsEnv"
><A NAME="v%3AgetXPathWithNsEnv"
></A
></A
><B
>getXPathWithNsEnv</B
> :: <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AAttributes"
>Attributes</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTrees"
>XmlTrees</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Select parts of a document by a namespace aware XPath expression.
</P
><P
>Works like <TT
><A HREF="Text-XML-HXT-XPath-XPathEval.html#v%3AgetXPath"
>getXPath</A
></TT
> but the prefix:localpart names in the XPath expression
 are interpreted with respect to the given namespace environment
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getXPathSubTrees"
><A NAME="v%3AgetXPathSubTrees"
></A
></A
><B
>getXPathSubTrees</B
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTrees"
>XmlTrees</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Select parts of an XML tree by a XPath expression.
</P
><P
>The main filter for selecting parts of an arbitrary XML tree via XPath.
 The string argument must be a XPath expression with an absolute location path,
 There are no restrictions on the arument tree.
</P
><P
>No canonicalization is performed before evaluating the query
</P
><P
>Result is a possibly empty list of XmlTrees forming the set of selected XPath values.
 XPath values other than XmlTrees (numbers, attributes, tagnames, ...)
 are convertet to text nodes.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getXPathSubTreesWithNsEnv"
><A NAME="v%3AgetXPathSubTreesWithNsEnv"
></A
></A
><B
>getXPathSubTreesWithNsEnv</B
> :: <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AAttributes"
>Attributes</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTrees"
>XmlTrees</A
></TD
></TR
><TR
><TD CLASS="doc"
>Same as <TT
><A HREF="Text-XML-HXT-XPath-XPathEval.html#v%3AgetXPathSubTrees"
>getXPathSubTrees</A
></TT
> but with namespace aware XPath expression
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getXPathNodeSet"
><A NAME="v%3AgetXPathNodeSet"
></A
></A
><B
>getXPathNodeSet</B
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlNodeSet"
>XmlNodeSet</A
></TD
></TR
><TR
><TD CLASS="doc"
>compute the node set of an XPath query
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getXPathNodeSetWithNsEnv"
><A NAME="v%3AgetXPathNodeSetWithNsEnv"
></A
></A
><B
>getXPathNodeSetWithNsEnv</B
> :: <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AAttributes"
>Attributes</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlNodeSet"
>XmlNodeSet</A
></TD
></TR
><TR
><TD CLASS="doc"
>compute the node set of a namespace aware XPath query
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:evalExpr"
><A NAME="v%3AevalExpr"
></A
></A
><B
>evalExpr</B
> :: <A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AEnv"
>Env</A
> -&gt; <A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AContext"
>Context</A
> -&gt; <A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AExpr"
>Expr</A
> -&gt; <A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AXPathFilter"
>XPathFilter</A
></TD
></TR
><TR
><TD CLASS="doc"
>The main evaluation entry point. 
 Each XPath-<TT
><A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AExpr"
>Expr</A
></TT
> is mapped to an evaluation function. The <TT
><A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AEnv"
>Env</A
></TT
>-parameter contains the set of global variables
 for the evaluator, the <TT
><A HREF="Text-XML-HXT-XPath-XPathDataTypes.html#t%3AContext"
>Context</A
></TT
>-parameter the root of the tree in which the expression is evaluated.
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="botbar"
>Produced by <A HREF="http://www.haskell.org/haddock/"
>Haddock</A
> version 2.5.0</TD
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