MarkLogic Content Pump (mlcp)

Example Implementation

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Example Implementation

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Last Updated: April 14, 2026
1 minute read

MarkLogic Server
Version 11.0
Documentation

The following example adds an attribute to incoming XML documents and leaves non-XML documents unmodified. The attribute value is specified on the mlcp command line, using the -transform_param option.

declare function example:transform(
  $content as map:map,
  $context as map:map
) as map:map*
{
  let $attr-value := 
   (map:get($context, "transform_param"), "UNDEFINED")[1]
  let $the-doc := map:get($content, "value")
  return
    if (fn:empty($the-doc/element()))
    then $content
    else
      let $root := $the-doc/*
      return (
        map:put($content, "value",
          document {
            $root/preceding-sibling::node(),
            element {fn:name($root)} {
              attribute { fn:QName("", "NEWATTR") } {$attr-value},
              $root/@*,
              $root/node()
            },
            $root/following-sibling::node()
          }
        ), $content
      )
};

For an end-to-end example of using this transform, see Example: Server-Side Content Transformation.