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-AllergyVerificationStatus-1"/>
   <extension url="http://hl7.org/fhir/StructureDefinition/valueset-map">
      <valueReference>
         <reference value="https://fhir.hl7.org.uk/STU3/ConceptMap/CareConnect-AllergyVerificationStatus-1"/>
      </valueReference>
   </extension>
   <extension url="http://hl7.org/fhir/StructureDefinition/valueset-sourceReference">
      <valueUri value="http://hl7.org/fhir/ValueSet/allergy-verification-status"/>
   </extension>
   <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
      <valueCode value="pc"/>
   </extension>
   <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
      <valueInteger value="3"/>
   </extension>
   <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-ballot-status">
      <valueString value="Informative"/>
   </extension>
   <url value="https://fhir.hl7.org.uk/STU3/ValueSet/CareConnect-AllergyVerificationStatus-1"/>
   <identifier>
      <system value="urn:ietf:rfc:3986"/>
      <value value="urn:oid:2.16.840.1.113883.4.642.3.115"/>
   </identifier>
   <version value="3.0.1"/>
   <name value="AllergyIntoleranceVerificationStatus"/>
   <status value="active"/>
   <date value="2017-04-19T07:44:47+10:00"/>
   <publisher value="HL7 (FHIR Project)"/>
   <contact>
      <telecom>
         <system value="url"/>
         <value value="http://hl7.org/fhir"/>
      </telecom>
   </contact>
   <description value="Assertion about certainty associated with a propensity, or potential risk, of a reaction to the identified substance."/>
   <copyright value="Copyright © HL7.org 2011+"/>
   <compose>
      <include>
         <system value="http://hl7.org/fhir/allergy-verification-status"/>
         <concept>
            <code value="unconfirmed"/>
            <display value="Unconfirmed"/>
         </concept>
         <concept>
            <code value="confirmed"/>
            <display value="Confirmed"/>
         </concept>
      </include>
   </compose>
</ValueSet>