This is a HL7 FHIR server, and as you appear to be accessing this page from a web browser you are seeing a HTML version of the requested resource(s). You can also access this URL from a FHIR client as a ReSTful API call. For more details please see the HL7 FHIR specification.
<?xml version="1.0" encoding="UTF-8" standalone="no"?><CodeSystem xmlns="">
   <id value="CareConnect-NHSDataDictionary-PersonMaritalStatus-1"/>
   <extension url="">
      <valueUri value=""/>
   <url value=""/>
   <version value="1.0.0"/>
   <name value="NHS Data Model and Dictionary Person Marital Status Code"/>
   <status value="active"/>
   <date value="2016-08-03T00:00:00+01:00"/>
   <publisher value="HL7 UK"/>
   <description value="An indicator to identify the legal marital status of a Person."/>
   <copyright value="Copyright © 2016 HL7 UK"/>
   <caseSensitive value="true"/>
   <content value="complete"/>
      <code value="S"/>
      <display value="Single"/>
      <code value="M"/>
      <display value="Married/Civil Partner"/>
      <code value="D"/>
      <display value="Divorced/Person whose Civil Partnership has been dissolved"/>
      <code value="W"/>
      <display value="Widowed/Surviving Civil Partner"/>
      <code value="P"/>
      <display value="Separated"/>
      <code value="N"/>
      <display value="Not disclosed"/>