Sophie: haskell-hxt-8.3.2-1mdv2010.1 x86

haskell-hxt-8.3.2-1mdv2010.1.x86_64.rpm

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>Text.XML.HXT.Arrow.Pickle.Xml</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
></TR
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><TD CLASS="modulebar"
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><FONT SIZE="6"
>Text.XML.HXT.Arrow.Pickle.Xml</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
>Pickler functions for converting between user defined data types
   and XmlTree data. Usefull for persistent storage and retreival
   of arbitray data as XML documents
</P
><P
>This module is an adaptation of the pickler combinators
   developed by Andrew Kennedy
   ( http://research.microsoft.com/~akenn/fun/picklercombinators.pdf )
</P
><P
>The difference to Kennedys approach is that the target is not
   a list of Chars but a list of XmlTrees. The basic picklers will
   convert data into XML text nodes. New are the picklers for
   creating elements and attributes.
</P
><P
>One extension was neccessary: The unpickling may fail.
   Therefore the unpickler has a Maybe result type.
   Failure is used to unpickle optional elements
   (Maybe data) and lists of arbitray length
</P
><P
>There is an example program demonstrating the use
   of the picklers for a none trivial data structure.
   (see &quot;examples/arrows/pickle&quot; directory)
</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"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3ASt"
>St</A
>  = <A HREF="#v%3ASt"
>St</A
> {<TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="recfield"
><A HREF="#v%3Aattributes"
>attributes</A
> :: [<A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
>]</TD
></TR
><TR
><TD CLASS="recfield"
><A HREF="#v%3Acontents"
>contents</A
> :: [<A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
>]</TD
></TR
></TABLE
>}</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3APU"
>PU</A
> a = <A HREF="#v%3APU"
>PU</A
> {<TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="recfield"
><A HREF="#v%3AappPickle"
>appPickle</A
> :: (a, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
>) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
></TD
></TR
><TR
><TD CLASS="recfield"
><A HREF="#v%3AappUnPickle"
>appUnPickle</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; (<A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
>)</TD
></TR
><TR
><TD CLASS="recfield"
><A HREF="#v%3AtheSchema"
>theSchema</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Schema.html#t%3ASchema"
>Schema</A
></TD
></TR
></TABLE
>}</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AemptySt"
>emptySt</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AaddAtt"
>addAtt</A
> :: <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AaddCont"
>addCont</A
> :: <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AdropCont"
>dropCont</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetAtt"
>getAtt</A
> :: <A HREF="Text-XML-HXT-DOM-QualifiedName.html#t%3AQName"
>QName</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetCont"
>getCont</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3ApickleDoc"
>pickleDoc</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; a -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AunpickleDoc"
>unpickleDoc</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpZero"
>xpZero</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpUnit"
>xpUnit</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpLift"
>xpLift</A
> ::  a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpLiftMaybe"
>xpLiftMaybe</A
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpCondSeq"
>xpCondSeq</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; (b -&gt; a) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; (a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpSeq"
>xpSeq</A
> ::  (b -&gt; a) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; (a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpChoice"
>xpChoice</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; (a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpWrap"
>xpWrap</A
> ::  (a -&gt; b, b -&gt; a) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpWrapMaybe"
>xpWrapMaybe</A
> ::  (a -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> b, b -&gt; a) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpPair"
>xpPair</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (a, b)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpTriple"
>xpTriple</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> c -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (a, b, c)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Axp4Tuple"
>xp4Tuple</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> c -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> d -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (a, b, c, d)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Axp5Tuple"
>xp5Tuple</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> c -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> d -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> e -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (a, b, c, d, e)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Axp6Tuple"
>xp6Tuple</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> c -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> d -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> e -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> f -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (a, b, c, d, e, f)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpText"
>xpText</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpTextDT"
>xpTextDT</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Schema.html#t%3ASchema"
>Schema</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpText0"
>xpText0</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpText0DT"
>xpText0DT</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Schema.html#t%3ASchema"
>Schema</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpPrim"
>xpPrim</A
> :: (<A HREF="/usr/share/doc/ghc/libraries/base/Text-Read.html#t%3ARead"
>Read</A
> a, <A HREF="/usr/share/doc/ghc/libraries/base/Text-Show.html#t%3AShow"
>Show</A
> a) =&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpTree"
>xpTree</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpTrees"
>xpTrees</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> [<A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
>]</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpXmlText"
>xpXmlText</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpOption"
>xpOption</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (<A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpDefault"
>xpDefault</A
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Eq.html#t%3AEq"
>Eq</A
> a =&gt; a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpList"
>xpList</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> [a]</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpList1"
>xpList1</A
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> [a]</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpMap"
>xpMap</A
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Ord.html#t%3AOrd"
>Ord</A
> k =&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> k -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> v -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (<A HREF="/usr/share/doc/ghc/libraries/containers/Data-Map.html#t%3AMap"
>Map</A
> k v)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpAlt"
>xpAlt</A
> ::  (a -&gt; <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
>) -&gt; [<A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a] -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpElemQN"
>xpElemQN</A
> ::  <A HREF="Text-XML-HXT-DOM-QualifiedName.html#t%3AQName"
>QName</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpElem"
>xpElem</A
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpElemWithAttrValue"
>xpElemWithAttrValue</A
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpAttrQN"
>xpAttrQN</A
> ::  <A HREF="Text-XML-HXT-DOM-QualifiedName.html#t%3AQName"
>QName</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpAttr"
>xpAttr</A
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpAttrImplied"
>xpAttrImplied</A
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (<A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a)</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpAttrFixed"
>xpAttrFixed</A
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AxpAddFixedAttr"
>xpAddFixedAttr</A
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>class</SPAN
>  <A HREF="#t%3AXmlPickler"
>XmlPickler</A
> a  <SPAN CLASS="keyword"
>where</SPAN
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="#v%3Axpickle"
>xpickle</A
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
></TABLE
></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"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:St"
><A NAME="t%3ASt"
></A
></A
><B
>St</B
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="section4"
>Constructors</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="5" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:St"
><A NAME="v%3ASt"
></A
></A
><B
>St</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="body" COLSPAN="2"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:attributes"
><A NAME="v%3Aattributes"
></A
></A
><B
>attributes</B
> :: [<A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
>]</TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:contents"
><A NAME="v%3Acontents"
></A
></A
><B
>contents</B
> :: [<A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
>]</TD
><TD CLASS="rdoc"
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:PU"
><A NAME="t%3APU"
></A
></A
><B
>PU</B
> a </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="section4"
>Constructors</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="5" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:PU"
><A NAME="v%3APU"
></A
></A
><B
>PU</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="body" COLSPAN="2"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:appPickle"
><A NAME="v%3AappPickle"
></A
></A
><B
>appPickle</B
> :: (a, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
>) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:appUnPickle"
><A NAME="v%3AappUnPickle"
></A
></A
><B
>appUnPickle</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; (<A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
>)</TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:theSchema"
><A NAME="v%3AtheSchema"
></A
></A
><B
>theSchema</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Schema.html#t%3ASchema"
>Schema</A
></TD
><TD CLASS="rdoc"
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:emptySt"
><A NAME="v%3AemptySt"
></A
></A
><B
>emptySt</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:addAtt"
><A NAME="v%3AaddAtt"
></A
></A
><B
>addAtt</B
> :: <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:addCont"
><A NAME="v%3AaddCont"
></A
></A
><B
>addCont</B
> :: <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:dropCont"
><A NAME="v%3AdropCont"
></A
></A
><B
>dropCont</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getAtt"
><A NAME="v%3AgetAtt"
></A
></A
><B
>getAtt</B
> :: <A HREF="Text-XML-HXT-DOM-QualifiedName.html#t%3AQName"
>QName</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getCont"
><A NAME="v%3AgetCont"
></A
></A
><B
>getCont</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3ASt"
>St</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:pickleDoc"
><A NAME="v%3ApickleDoc"
></A
></A
><B
>pickleDoc</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; a -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>conversion of an arbitrary value into an XML document tree.
</P
><P
>The pickler, first parameter, controls the conversion process.
 Result is a complete document tree including a root node
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:unpickleDoc"
><A NAME="v%3AunpickleDoc"
></A
></A
><B
>unpickleDoc</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>Conversion of an XML document tree into an arbitrary data type
</P
><P
>The inverse of <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3ApickleDoc"
>pickleDoc</A
></TT
>.
 This law should hold for all picklers: <TT
> unpickle px . pickle px $ v == Just v </TT
>.
 Not every possible combination of picklers make sense.
 For reconverting a value from an XML tree, is becomes neccessary,
 to introduce &quot;enough&quot; markup for unpickling the value
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpZero"
><A NAME="v%3AxpZero"
></A
></A
><B
>xpZero</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>The zero pickler
</P
><P
>Encodes nothing, fails always during unpickling
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpUnit"
><A NAME="v%3AxpUnit"
></A
></A
><B
>xpUnit</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpLift"
><A NAME="v%3AxpLift"
></A
></A
><B
>xpLift</B
> ::  a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>Lift a value to a pickler
</P
><P
>When pickling, nothing is encoded, when unpickling, the given value is inserted.
 This pickler always succeeds.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpLiftMaybe"
><A NAME="v%3AxpLiftMaybe"
></A
></A
><B
>xpLiftMaybe</B
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>Lift a Maybe value to a pickler.
</P
><P
><TT
>Nothing</TT
> is mapped to the zero pickler, <TT
>Just x</TT
> is pickled with <TT
>xpLift x</TT
>.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpCondSeq"
><A NAME="v%3AxpCondSeq"
></A
></A
><B
>xpCondSeq</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; (b -&gt; a) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; (a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b</TD
></TR
><TR
><TD CLASS="doc"
><P
>pickle/unpickle combinator for sequence and choice.
</P
><P
>When the first unpickler fails,
 the second one is taken, else the third one configured with the result from the first
 is taken. This pickler is a generalisation for <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpSeq"
>xpSeq</A
></TT
> and <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpChoice"
>xpChoice</A
></TT
> .
</P
><P
>The schema must be attached later, e.g. in xpPair or other higher level combinators
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpSeq"
><A NAME="v%3AxpSeq"
></A
></A
><B
>xpSeq</B
> ::  (b -&gt; a) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; (a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b</TD
></TR
><TR
><TD CLASS="doc"
><P
>Combine two picklers sequentially.
</P
><P
>If the first fails during
 unpickling, the whole unpickler fails
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpChoice"
><A NAME="v%3AxpChoice"
></A
></A
><B
>xpChoice</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; (a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b</TD
></TR
><TR
><TD CLASS="doc"
><P
>combine tow picklers with a choice
</P
><P
>Run two picklers in sequence like with xpSeq.
 When during unpickling the first one fails,
 an alternative pickler (first argument) is applied.
 This pickler is only used as combinator for unpickling.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpWrap"
><A NAME="v%3AxpWrap"
></A
></A
><B
>xpWrap</B
> ::  (a -&gt; b, b -&gt; a) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b</TD
></TR
><TR
><TD CLASS="doc"
><P
>map value into another domain and apply pickler there
</P
><P
>One of the most often used picklers.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpWrapMaybe"
><A NAME="v%3AxpWrapMaybe"
></A
></A
><B
>xpWrapMaybe</B
> ::  (a -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> b, b -&gt; a) -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b</TD
></TR
><TR
><TD CLASS="doc"
><P
>like <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpWrap"
>xpWrap</A
></TT
>, but if the inverse mapping is undefined, the unpickler fails
</P
><P
>Map a value into another domain. If the inverse mapping is
 undefined (Nothing), the unpickler fails
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpPair"
><A NAME="v%3AxpPair"
></A
></A
><B
>xpPair</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (a, b)</TD
></TR
><TR
><TD CLASS="doc"
><P
>pickle a pair of values sequentially
</P
><P
>Used for pairs or together with wrap for pickling
 algebraic data types with two components
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpTriple"
><A NAME="v%3AxpTriple"
></A
></A
><B
>xpTriple</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> c -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (a, b, c)</TD
></TR
><TR
><TD CLASS="doc"
>Like <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpPair"
>xpPair</A
></TT
> but for triples
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xp4Tuple"
><A NAME="v%3Axp4Tuple"
></A
></A
><B
>xp4Tuple</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> c -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> d -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (a, b, c, d)</TD
></TR
><TR
><TD CLASS="doc"
>Like <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpPair"
>xpPair</A
></TT
> and <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpTriple"
>xpTriple</A
></TT
> but for 4-tuples
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xp5Tuple"
><A NAME="v%3Axp5Tuple"
></A
></A
><B
>xp5Tuple</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> c -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> d -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> e -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (a, b, c, d, e)</TD
></TR
><TR
><TD CLASS="doc"
>Like <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpPair"
>xpPair</A
></TT
> and <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpTriple"
>xpTriple</A
></TT
> but for 5-tuples
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xp6Tuple"
><A NAME="v%3Axp6Tuple"
></A
></A
><B
>xp6Tuple</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> b -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> c -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> d -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> e -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> f -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (a, b, c, d, e, f)</TD
></TR
><TR
><TD CLASS="doc"
>Like <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpPair"
>xpPair</A
></TT
> and <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpTriple"
>xpTriple</A
></TT
> but for 6-tuples
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpText"
><A NAME="v%3AxpText"
></A
></A
><B
>xpText</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickle a string into an XML text node
</P
><P
>One of the most often used primitive picklers. Attention:
 For pickling empty strings use <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpText0"
>xpText0</A
></TT
>. If the text has a more
 specific datatype than xsd:string, use <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpTextDT"
>xpTextDT</A
></TT
>
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpTextDT"
><A NAME="v%3AxpTextDT"
></A
></A
><B
>xpTextDT</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Schema.html#t%3ASchema"
>Schema</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickle a string into an XML text node
</P
><P
>Text pickler with a description of the structure of the text
 by a schema. A schema for a data type can be defined by <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Schema.html#v%3AscDT"
>scDT</A
></TT
>.
 In Text.XML.HXT.Arrow.Pickle.Schema there are some more functions for creating
 simple datatype descriptions.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpText0"
><A NAME="v%3AxpText0"
></A
></A
><B
>xpText0</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickle a possibly empty string into an XML node.
</P
><P
>Must be used in all places, where empty strings are legal values.
 If the content of an element can be an empty string, this string disapears
 during storing the DOM into a document and reparse the document.
 So the empty text node becomes nothing, and the pickler must deliver an empty string,
 if there is no text node in the document.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpText0DT"
><A NAME="v%3AxpText0DT"
></A
></A
><B
>xpText0DT</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Schema.html#t%3ASchema"
>Schema</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickle a possibly empty string with a datatype description into an XML node.
</P
><P
>Like <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpText0"
>xpText0</A
></TT
> but with extra Parameter for datatype description as in <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpTextDT"
>xpTextDT</A
></TT
>.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpPrim"
><A NAME="v%3AxpPrim"
></A
></A
><B
>xpPrim</B
> :: (<A HREF="/usr/share/doc/ghc/libraries/base/Text-Read.html#t%3ARead"
>Read</A
> a, <A HREF="/usr/share/doc/ghc/libraries/base/Text-Show.html#t%3AShow"
>Show</A
> a) =&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickle an arbitrary value by applyling show during pickling
 and read during unpickling.
</P
><P
>Real pickling is then done with <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpText"
>xpText</A
></TT
>.
 One of the most often used pimitive picklers. Applicable for all
 types which are instances of <TT
>Read</TT
> and <TT
>Show</TT
>
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpTree"
><A NAME="v%3AxpTree"
></A
></A
><B
>xpTree</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickle an XmlTree by just adding it
</P
><P
>Usefull for components of type XmlTree in other data structures
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpTrees"
><A NAME="v%3AxpTrees"
></A
></A
><B
>xpTrees</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> [<A HREF="Text-XML-HXT-DOM-TypeDefs.html#t%3AXmlTree"
>XmlTree</A
>]</TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickle a whole list of XmlTrees by just adding the list, unpickle is done by taking all element contens.
</P
><P
>This pickler should always combined with <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpElem"
>xpElem</A
></TT
> for taking the whole contents of an element.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpXmlText"
><A NAME="v%3AxpXmlText"
></A
></A
><B
>xpXmlText</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickle a string representing XML contents by inserting the tree representation into the XML document.
</P
><P
>Unpickling is done by converting the contents with
 <TT
><A HREF="Text-XML-HXT-Arrow-Edit.html#v%3AxshowEscapeXml"
>xshowEscapeXml</A
></TT
> into a string,
 this function will escape all XML special chars, such that pickling the value back becomes save.
 Pickling is done with <TT
><A HREF="Text-XML-HXT-Arrow-ReadDocument.html#v%3Axread"
>xread</A
></TT
>
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpOption"
><A NAME="v%3AxpOption"
></A
></A
><B
>xpOption</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (<A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a)</TD
></TR
><TR
><TD CLASS="doc"
><P
>Encoding of optional data by ignoring the Nothing case during pickling
 and relying on failure during unpickling to recompute the Nothing case
</P
><P
>The default pickler for Maybe types
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpDefault"
><A NAME="v%3AxpDefault"
></A
></A
><B
>xpDefault</B
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Eq.html#t%3AEq"
>Eq</A
> a =&gt; a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>Optional conversion with default value
</P
><P
>The default value is not encoded in the XML document,
 during unpickling the default value is inserted if the pickler fails
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpList"
><A NAME="v%3AxpList"
></A
></A
><B
>xpList</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> [a]</TD
></TR
><TR
><TD CLASS="doc"
><P
>Encoding of list values by pickling all list elements sequentially.
</P
><P
>Unpickler relies on failure for detecting the end of the list.
 The standard pickler for lists. Can also be used in combination with <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpWrap"
>xpWrap</A
></TT
>
 for constructing set and map picklers
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpList1"
><A NAME="v%3AxpList1"
></A
></A
><B
>xpList1</B
> ::  <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> [a]</TD
></TR
><TR
><TD CLASS="doc"
><P
>Encoding of a none empty list of values
</P
><P
>Attention: when calling this pickler with an empty list,
 an internal error &quot;head of empty list is raised&quot;.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpMap"
><A NAME="v%3AxpMap"
></A
></A
><B
>xpMap</B
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Ord.html#t%3AOrd"
>Ord</A
> k =&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> k -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> v -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (<A HREF="/usr/share/doc/ghc/libraries/containers/Data-Map.html#t%3AMap"
>Map</A
> k v)</TD
></TR
><TR
><TD CLASS="doc"
><P
>Standard pickler for maps
</P
><P
>This pickler converts a map into a list of pairs.
 All key value pairs are mapped to an element with name (1.arg),
 the key is encoded as an attribute named by the 2. argument,
 the 3. arg is the pickler for the keys, the last one for the values
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpAlt"
><A NAME="v%3AxpAlt"
></A
></A
><B
>xpAlt</B
> ::  (a -&gt; <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
>) -&gt; [<A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a] -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickler for sum data types.
</P
><P
>Every constructor is mapped to an index into the list of picklers.
 The index is used only during pickling, not during unpickling, there the 1. match is taken
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpElemQN"
><A NAME="v%3AxpElemQN"
></A
></A
><B
>xpElemQN</B
> ::  <A HREF="Text-XML-HXT-DOM-QualifiedName.html#t%3AQName"
>QName</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickler for wrapping/unwrapping data into an XML element
</P
><P
>Extra parameter is the element name given as a QName. THE pickler for constructing
 nested structures
</P
><P
>Example:
</P
><PRE
> xpElemQN (mkName &quot;number&quot;) $ xpickle
</PRE
><P
>will map an (42::Int) onto
</P
><PRE
> &lt;number&gt;42&lt;/number&gt;
</PRE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpElem"
><A NAME="v%3AxpElem"
></A
></A
><B
>xpElem</B
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>convenient Pickler for xpElemQN
</P
><PRE
> xpElem n = xpElemQN (mkName n)
</PRE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpElemWithAttrValue"
><A NAME="v%3AxpElemWithAttrValue"
></A
></A
><B
>xpElemWithAttrValue</B
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickler for wrapping/unwrapping data into an XML element with an attribute with given value
</P
><P
>To make XML structures flexible but limit the number of different elements, it's sometimes
 useful to use a kind of generic element with a key value structure
</P
><P
>Example:
</P
><PRE
> &lt;attr name=&quot;key1&quot;&gt;value1&lt;/attr&gt;
 &lt;attr name=&quot;key2&quot;&gt;value2&lt;/attr&gt;
 &lt;attr name=&quot;key3&quot;&gt;value3&lt;/attr&gt;
</PRE
><P
>the Haskell datatype may look like this
</P
><PRE
> type T = T { key1 :: Int ; key2 :: String ; key3 :: Double }
</PRE
><P
>Then the picker for that type looks like this
</P
><PRE
> xpT :: PU T
 xpT = xpWrap ( uncurry3 T, \ t -&gt; (key1 t, key2 t, key3 t) ) $
       xpTriple (xpElemWithAttrValue &quot;attr&quot; &quot;name&quot; &quot;key1&quot; $ xpickle)
                (xpElemWithAttrValue &quot;attr&quot; &quot;name&quot; &quot;key2&quot; $ xpText0)
                (xpElemWithAttrValue &quot;attr&quot; &quot;name&quot; &quot;key3&quot; $ xpickle)
</PRE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpAttrQN"
><A NAME="v%3AxpAttrQN"
></A
></A
><B
>xpAttrQN</B
> ::  <A HREF="Text-XML-HXT-DOM-QualifiedName.html#t%3AQName"
>QName</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>Pickler for storing/retreiving data into/from an attribute value
</P
><P
>The attribute is inserted in the surrounding element constructed by the <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpElem"
>xpElem</A
></TT
> pickler
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpAttr"
><A NAME="v%3AxpAttr"
></A
></A
><B
>xpAttr</B
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>convenient Pickler for xpAttrQN
</P
><PRE
> xpAttr n = xpAttrQN (mkName n)
</PRE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpAttrImplied"
><A NAME="v%3AxpAttrImplied"
></A
></A
><B
>xpAttrImplied</B
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> (<A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a)</TD
></TR
><TR
><TD CLASS="doc"
>Add an optional attribute for an optional value (Maybe a).
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpAttrFixed"
><A NAME="v%3AxpAttrFixed"
></A
></A
><B
>xpAttrFixed</B
> :: <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:xpAddFixedAttr"
><A NAME="v%3AxpAddFixedAttr"
></A
></A
><B
>xpAddFixedAttr</B
> ::  <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="/usr/share/doc/ghc/libraries/base/Data-Char.html#t%3AString"
>String</A
> -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a -&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
><TR
><TD CLASS="doc"
><P
>Add an attribute with a fixed value.
</P
><P
>Useful e.g. to declare namespaces. Is implemented by <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3AxpAttrFixed"
>xpAttrFixed</A
></TT
>
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>class</SPAN
>  <A NAME="t:XmlPickler"
><A NAME="t%3AXmlPickler"
></A
></A
><B
>XmlPickler</B
> a  <SPAN CLASS="keyword"
>where</SPAN
></TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="ndoc"
>The class for overloading <TT
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#v%3Axpickle"
>xpickle</A
></TT
>, the default pickler
</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="section4"
>Methods</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A NAME="v:xpickle"
><A NAME="v%3Axpickle"
></A
></A
><B
>xpickle</B
> :: <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3APU"
>PU</A
> a</TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="section4"
><IMG SRC="minus.gif" CLASS="coll" ONCLICK="toggle(this,'i:XmlPickler')" ALT="show/hide"
> Instances</TD
></TR
><TR
><TD CLASS="body"
><DIV ID="i:XmlPickler" STYLE="display:block;"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="decl"
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> <A HREF="/usr/share/doc/ghc/libraries/integer/GHC-Integer.html#t%3AInteger"
>Integer</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> <A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> a =&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> ([] a)</TD
></TR
><TR
><TD CLASS="decl"
><A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> a =&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> (<A HREF="/usr/share/doc/ghc/libraries/base/Data-Maybe.html#t%3AMaybe"
>Maybe</A
> a)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> a, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> b) =&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> (<A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Tuple.html#t%3A%28%2C%29"
>(,)</A
> a b)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> a, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> b, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> c) =&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> (<A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Tuple.html#t%3A%28%2C%2C%29"
>(,,)</A
> a b c)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> a, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> b, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> c, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> d) =&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> (<A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Tuple.html#t%3A%28%2C%2C%2C%29"
>(,,,)</A
> a b c d)</TD
></TR
><TR
><TD CLASS="decl"
>(<A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> a, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> b, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> c, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> d, <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> e) =&gt; <A HREF="Text-XML-HXT-Arrow-Pickle-Xml.html#t%3AXmlPickler"
>XmlPickler</A
> (<A HREF="/usr/share/doc/ghc/libraries/ghc-prim/GHC-Tuple.html#t%3A%28%2C%2C%2C%2C%29"
>(,,,,)</A
> a b c d e)</TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
></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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