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"?><ValueSet xmlns="http://hl7.org/fhir">
   <id value="CareConnect-EthnicCategory-1"/>
   <extension url="http://hl7.org/fhir/StructureDefinition/valueset-sourceReference">
      <valueUri value="http://www.datadictionary.nhs.uk/data_dictionary/data_field_notes/p/pds/pds_ethnic_category_code_de.asp?shownav=0"/>
   </extension>
   <url value="https://fhir.hl7.org.uk/STU3/ValueSet/CareConnect-EthnicCategory-1"/>
   <identifier>
      <system value="urn:ietf:rfc:3986"/>
      <value value="urn:oid:2.16.840.1.113883.2.1.3.2.4.16.6"/>
   </identifier>
   <version value="1.1.0"/>
   <name value="Care Connect Ethnic Category"/>
   <status value="draft"/>
   <date value="2018-11-02T00:00:00+00:00"/>
   <publisher value="HL7 UK"/>
   <description value="A ValueSet to identify the ethnicity of a Person, as specified by the Person. This vocabulary describes a persons ethnic category, it is an extension of the Ethnic Category Code described in the NHS Data Model and Dictionary."/>
   <copyright value="Copyright © 2016 HL7 UK"/>
   <compose>
      <include>
         <system value="https://fhir.hl7.org.uk/STU3/CodeSystem/CareConnect-EthnicCategory-1"/>
      </include>
   </compose>
</ValueSet>