Clarify type designators for UOM patterns

ssn/chapters/Actuation.html

@@ -76,7 +76,7 @@ <h5><a href="#SOSAActuation">sosa:Actuation</a></h5>
                 property to verify that the result value has been obtained..
             </span>
         </p>
-        <p class="note">The different time-properties on a <a href="#SOSAActuation">sosa:Actuation</a> support
+        <p class="note"> The different time-properties on a <a href="#SOSAActuation">sosa:Actuation</a> support
             the description of plans, forecasts and predictions as well as descriptions of various historical
             scenarios.
             See <a href="#times">Temporal properties</a> for patterns related to these.</p>
@@ -357,7 +357,8 @@ <h5><a href="#SOSAActuator">sosa:Actuator</a></h5>
                     href="#SOSAProcedure">Procedure</a> that changes the value of a <a
                     href="#SOSAProperty">Property</a></span> <br>
         </p>
-        <p class="note">An Actuator may have a geographic location. See <a href="#systems-platforms-deployments">Location and Geometry</a> for
+        <p class="note">An Actuator may have a geographic location. See <a
+                href="#systems-platforms-deployments">Location and Geometry</a> for
             patterns to describe this.</p>
 
         <table>

ssn/chapters/ModelQuantity.html

@@ -5,34 +5,31 @@ <h3>Quantity Values and Units of Measure</h3>
     of measure.
 </p>
 <p>
-    It out of the scope of this specification to recommend a particular way of representing quantitative results.
+    It is out of the scope of this specification to recommend a particular way of representing quantitative results.
     Several external vocabularies are available for expressing quantities as OWL individuals, or as datatypes.
     Examples include
     the Quantities, Units, Dimensions and Data Types Ontologies (QUDT, [[QUDT]])
-    <!-- , the Ontology of Units of Measure (OM, [[Rijgersberg-et-al-2013]]) -->
     , and the St Etienne School of Mines <i>Custom Datatypes</i> (CDT, [[CDT]]).
 </p>
 <p>
-    With QUDT, a quantitative result can be a <a href="http://qudt.org/"><code>qudt:QuantityValue</code></a>
+    With QUDT, a quantitative result can be a <a href="http://qudt.org/"><code>qudt:QuantityValue</code></a>.
+    Its unit of measure <a href="http://qudt.org/vocab/unit/DEG_C">unit:DEG_C</a> is an individual from the QUDT
+    catalogue of units of measure.
 </p>
 <pre class="example" data-include="./rdf/examples/UOM-qudt-object.ttl" data-include-format="text"></pre>
 <p>
-    Alternatively, an IRI from the <a href="">QUDT catalogue of units of measure</a> can be used as the
-    <em>type designator</em> of a <a href="#SOSAhasSimpleResult"><code>sosa:hasSimpleResult</code></a>
+    Alternatively, an IRI from the <a href="">QUDT catalogue of units of measure</a> might be used as the
+    <em>type designator</em> of a <a href="#SOSAhasSimpleResult"><code>sosa:hasSimpleResult</code></a>.
+    For this usage the resource <code>unit:DEG_C</code> is an <code>rdfs:Datatype</code>.
 </p>
 <pre class="example" data-include="./rdf/examples/UOM-qudt-datatype.ttl" data-include-format="text"></pre>
 <p>
-    With CDT, the value of <a href="#SOSAhasSimpleResult"><code>sosa:hasSimpleResult</code></a> can be structured to
-    match an amount with a <a
-        href="https://ci.mines-stetienne.fr/lindt/v4/custom_datatypes#ucum"><code>cdt:ucum</code></a> code indicating
-    the unit of measurement [[UCUM]]
+    With CDT, the value of <a href="#SOSAhasSimpleResult"><code>sosa:hasSimpleResult</code></a> is a literal structured
+    as space-separated quantiy-value using the UCUM code for the unit of measurement [[UCUM]].
+    The type designator is
+    <a href="https://ci.mines-stetienne.fr/lindt/v4/custom_datatypes#ucum"><code>cdt:ucum</code></a> taken from [[CDT]].
 </p>
 <pre class="example" data-include="./rdf/examples/UOM-cdt.ttl" data-include-format="text"></pre>
-<!-- <p>
-        With OM 2, a quantitative result would be a <a
-            href="http://www.wurvoc.org/vocabularies/"><code>om:Measure</code> or <code>om:Point</code></a>
-        </p> -->
-<!-- <pre class="example" data-include="./rdf/examples/UOM-OM2.ttl" data-include-format="text"></pre> -->
 
 <p class="note">
     Custom datatypes are not strictly compatible with OWL, which restricts the set of datatypes that can be used.

ssn/rdf/examples/UOM-cdt.ttl

@@ -8,3 +8,6 @@ ex:Obs234534
   sosa:hasFeatureOfInterest ex:apt134 ;
   sosa:hasSimpleResult "-29.9 Cel"^^cdt:ucum ;
 .
+cdt:ucum 
+  a rdfs:Datatype ;
+.

ssn/rdf/examples/UOM-qudt-datatype.ttl

@@ -11,7 +11,6 @@ ex:Obs234534
   sosa:hasFeatureOfInterest ex:apt134 ;
   sosa:hasSimpleResult "-29.9"^^unit:DEG_C ;
 .
-unit:DEG_C
-  a qudt:Unit ;
-  rdfs:subClassOf xsd:decimal ;
+unit:DEG_C 
+  a rdfs:Datatype ;
 .

ssn/rdf/examples/UOM-qudt-object.ttl

@@ -22,3 +22,6 @@ ex:Obs83985
       qudt:value 22.4 ;
     ] ;
 .
+unit:DEG_C 
+  a qudt:Unit ;
+.