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.
<CodeSystem xmlns="http://hl7.org/fhir">
<id value="CareConnect-OutcomeOfAttendance-1"></id>
<text>
<status value="generated"></status>
</text>
<extension url="http://hl7.org/fhir/StructureDefinition/codesystem-sourceReference">
<valueUri value="http://www.datadictionary.nhs.uk/data_dictionary/attributes/o/out/outcome_of_attendance_de.asp?shownav=1"></valueUri>
</extension>
<url value="https://fhir.hl7.org.uk/STU3/CodeSystem/CareConnect-OutcomeOfAttendance-1"></url>
<version value="1.1.0"></version>
<name value="NHS Data Model and Dictionary Outcome of Attendance"></name>
<status value="draft"></status>
<date value="2018-11-14T00:00:00+00:00"></date>
<publisher value="HL7 UK"></publisher>
<description value="This records the outcome of an Out-Patient Attendance Consultant."></description>
<copyright value="Copyright © 2016 HL7 UK"></copyright>
<content value="complete"></content>
<concept>
<code value="1"></code>
<display value="Discharged from Consultant's care (last attendance)"></display>
</concept>
<concept>
<code value="2"></code>
<display value="Another Appointment given"></display>
</concept>
<concept>
<code value="3"></code>
<display value="Appointment to be made at a later date"></display>
</concept>
</CodeSystem>