How 'Basic' can be used for essoteric resources - in this case, a UML class model (id = "classModel")

<?xml version="1.0" encoding="UTF-8"?>

<Basic xmlns="http://hl7.org/fhir">
  <id value="classModel"/> 
  <text> 
    <status value="generated"/> 
    <div xmlns="http://www.w3.org/1999/xhtml">
      <p> <b> Class1</b> </p> 
      <ul> 
        <li> Attribute1: 1..*</li> 
        <li> Attribute2: 0..1</li> 
      </ul> 
    </div> 
  </text> 
  <extension url="http://example.org/do-not-use/fhir-extensions/UMLclass">
    <extension url="name">
      <valueString value="Class1"/> 
    </extension> 
    <extension url="attribute">
      <extension url="name">
        <valueString value="attribute1"/> 
      </extension> 
      <extension url="minOccurs">
        <valueInteger value="1"/> 
      </extension> 
      <extension url="maxOccurs">
        <valueCode value="*"/> 
      </extension> 
    </extension> 
    <extension url="attribute">
      <extension url="name">
        <valueString value="attribute2"/> 
      </extension> 
      <extension url="minOccurs">
        <valueInteger value="0"/> 
      </extension> 
      <extension url="maxOccurs">
        <valueInteger value="1"/> 
      </extension> 
    </extension> 
  </extension> 
  <code> 
    <coding> 
      <system value="http://example.org/do-not-use/fhir-codes#resourceTypes"/> 
      <code value="UMLCLASSMODEL"/> 
    </coding> 
  </code> 
</Basic>