MarkLogic Cookbook

Chapter 7. Document Searches

Finding documents is a core feature for searching in MarkLogic. Searches often begin with looking for simple words or phrases. Facets in the user interface, in the form of lists, graphs, or maps, allow users to drill into results. But MarkLogic’s Universal Index also captures the structure of documents.

The recipes in this chapter take advantage of the Universal Index to find documents with a specific root element and to look for documents that are missing some type of structure.

Search by Root Element

Problem

You want to look for documents that have a particular root XML element or JSON property and combine that with other search criteria.

Solution

Applies to MarkLogic versions 7 and higher

(: Return a query that finds documents with
 : the specified root element :)
declare function local:query-root($qname as xs:QName)
{
  let $ns := fn:namespace-uri-from-QName($qname)
  let $prefix := if ($ns eq "") then "" else "pre:"
  return
    xdmp:with-namespaces(
      map:new(
        map:entry("qry", "http://marklogic.com/cts/query")),
      cts:term-query(
        xdmp:value(
          "xdmp:plan(/" || $prefix ||
            fn:local-name-from-QName($qname) || ")",
          map:entry("pre", $ns)
        )/qry:final-plan//qry:term-query/qry:key
      )
  )
};

You can then call it like this:

declare namespace ml = "http://marklogic.com";

cts:search(
  fn:doc(),
  cts:and-query((
    local:query-root(xs:QName("ml:base")),
    cts:collection-query("published")
  ))
)

Discussion

It’s easy to find all the documents that have a particular root element ...