How to create Nested Contraints?

Question

Consider the following xml:

<Record>
   <Author>
      <FirstName>David</FirstName>
      <LastName>Raj</LastName>
   </Author>
   <Author>
      <FirstName>Sim</FirstName>
      <LastName>Son</LastName>
   </Author>
   <Editor>
      <FirstName>Sandy</FirstName>
      <LastName>John<LastName>
   </Editor>
</Record>

In present I use element-query to get the values from <Author>.

<constraint name="Author">
    <element-query ns="" name="Author" />
    {$OPTIONS}
</constraint>

I don't want to search or get the values of <LastName> element, but need only the value of <FirstName> of Author element alone. Is it possible to create nested-constraint for this?? If possible could anyone elaborate it??

Thanks.

Answer 1

Sofi:

You supply the criteria for the contained element in the query, not in the constraint.

In this case, you would create two constraints: an element-query constraint on the ContentOwnerType and a value constraint on the Description. Then, in the query, the element-constraint-query for ContentOwnerType should contain the value-constraint-query on the Description.

Here's the documentation for element-constraint-query:

http://docs.marklogic.com/guide/search-dev/structured-query#id_64263

As an alternative, you can define a field that includes ContentOwnerType and excludes Code:

http://docs.marklogic.com/guide/admin/fields#id_78911