ogical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.</p>
</td></tr><tr><td style="white-space: nowrap"><a href="http://hl7.org/fhir/R4/conformance-rules.html#conformance">Control</a></td><td><span style="color:DarkGray">1</span>..<span style="color:DarkGray">1</span></td></tr><tr><td style="white-space: nowrap"><a href="http://hl7.org/fhir/R4/datatypes.html">Type</a></td><td><span style="color:DarkGray"><a href="http://hl7.org