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