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NAME

       xmerl_xs -
              Erlang has similarities to XSLT since both languages
            have a functional programming approach.

DESCRIPTION

       Erlang  has  similarities  to  XSLT  since  both  languages  have a functional programming
       approach. Using xmerl_xpath it is possible to write XSLT like transforms in Erlang.

       XSLT stylesheets are often used when transforming XML documents, to other XML documents or
       (X)HTML  for  presentation.  XSLT  contains quite many functions and learning them all may
       take some effort. This document assumes a basic level of understanding of XSLT.

       Since XSLT is based on  a  functional  programming  approach  with  pattern  matching  and
       recursion  it  is  possible  to  write  similar style sheets in Erlang. At least for basic
       transforms. This document describes how to use  the  XPath  implementation  together  with
       Erlangs pattern matching and a couple of functions to write XSLT like transforms.

       This  approach  is  probably  easier  for  an  Erlanger  but  if you need to use real XSLT
       stylesheets in order to "comply to the standard" there is  an  adapter  available  to  the
       Sablotron XSLT package which is written i C++. See also the Tutorial.

EXPORTS

       built_in_rules(Fun, E) -> List

              The default fallback behaviour. Template funs should end with:
              template(E) -> built_in_rules(fun template/1, E).

       select(String::string(), E) -> E

              Extracts the nodes from the xml tree according to XPath.

              See also: value_of/1.

       value_of(E) -> List

              Types:

                 E = term()

              Concatenates all text nodes within the tree.

              Example:

                <xsl:template match="title">
                  <div align="center">
                    <h1><xsl:value-of select="." /></h1>
                  </div>
                </xsl:template>

              becomes:

                 template(E = #xmlElement{name='title'}) ->
                   ["<div align="center"><h1>",
                     value_of(select(".", E)), "</h1></div>"]

       xslapply(Fun::Function, EList::list()) -> List

              Types:

                 Function = () -> list()

              xslapply is a wrapper to make things look similar to xsl:apply-templates.

              Example, original XSLT:

                <xsl:template match="doc/title">
                  <h1>
                    <xsl:apply-templates/>
                  </h1>
                </xsl:template>

              becomes in Erlang:

                template(E = #xmlElement{ parents=[{'doc',_}|_], name='title'}) ->
                  ["<h1>",
                   xslapply(fun template/1, E),
                   "</h1>"];

AUTHORS

       <>

                                           xmerl 1.3.21                            xmerl_xs(3erl)