如何在Marklogic中创建元素范围索引？

I have the following xml:-

我有以下xml: -

<?xml version="1.0" encoding="UTF-8"?>
<patent-assignment>
  <assignment-record>
    <correspondent>
      <name>NORTH AMERICA INTERNATIONAL PATENT OFFIC</name>
      <address-1>P.O. BOX 506</address-1>
      <address-2>MERRIFIELD, VA 22116</address-2>
    </correspondent>
   </assignment-record>
  <patent-assignors>
    <patent-assignor>
      <name>TSAI, YU-WEN</name>
      <execution-date>
    <date>20050331</date>
      </execution-date>
    </patent-assignor>
    <patent-assignor>
      <name>HUANG, CHENG-I</name>
      <execution-date>
    <date>20050331</date>
      </execution-date>
    </patent-assignor>
  </patent-assignors>
  <patent-assignees>
    <patent-assignee>
      <name>FARADAY TECHNOLOGY CORP.</name>
      <address-1>NO.10-2, LI-HSIN ROAD 1, SCIENCE-BASED INDUSTRIAL PARK</address-1>
      <city>HSIN-CHU CITY</city>
      <country-name>TAIWAN</country-name>
    </patent-assignee>
  </patent-assignees>
 </patent-assignment>
<?xm