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.
<ConceptMap xmlns="http://hl7.org/fhir">
<id value="CareConnect-AllergyVerificationStatus-1"></id>
<text>
<status value="generated"></status>
</text>
<url value="https://fhir.hl7.org.uk/STU3/ConceptMap/CareConnect-AllergyVerificationStatus-1"></url>
<version value="1.1.0"></version>
<name value="Concept Map - Allergy Verification Status"></name>
<status value="draft"></status>
<date value="2018-11-14T00:00:00+00:00"></date>
<publisher value="HL7 UK"></publisher>
<description value="A Concept Map from ValueSet Allergy Verification Status to Allergy Certainity to aid interpretation."></description>
<copyright value="Copyright © 2016 HL7 UK"></copyright>
<sourceReference>
<reference value="https://fhir.hl7.org.uk/STU3/ValueSet/CareConnect-AllergyVerificationStatus-1"></reference>
</sourceReference>
<targetReference>
<reference value="https://fhir.hl7.org.uk/STU3/ValueSet/CareConnect-AllergyCertainty-1"></reference>
</targetReference>
<group>
<source value="http://hl7.org/fhir/allergy-verification-status"></source>
<target value="http://snomed.info/sct"></target>
<element>
<code value="unconfirmed"></code>
<display value="Unconfirmed"></display>
<target>
<code value="385434005"></code>
<display value="Improbable diagnosis"></display>
<equivalence value="equivalent"></equivalence>
</target>
</element>
<element>
<code value="unconfirmed"></code>
<display value="Unconfirmed"></display>
<target>
<code value="2931005"></code>
<display value="Probable diagnosis"></display>
<equivalence value="equivalent"></equivalence>
</target>
</element>
<element>
<code value="confirmed"></code>
<display value="Confirmed"></display>
<target>
<code value="255545003"></code>
<display value="Definite"></display>
<equivalence value="equivalent"></equivalence>
</target>
</element>
<element>
<code value="confirmed"></code>
<display value="Confirmed"></display>
<target>
<code value="410605003"></code>
<display value="Confirmed present"></display>
<equivalence value="equivalent"></equivalence>
</target>
</element>
</group>
</ConceptMap>