Update clause_07b_sensing_entities.adoc

sections/clause_07b_sensing_entities.adoc

@@ -1,13 +1,15 @@
 [[sensing-entities]]
-== The SensorThings API (2.0) Sensing Entities  
+=== Sensing Entities
 
 All data model requirements classes are grouped in the following requirements class:
 
+[requirements_class]
+.Sensing Entities
 
+====
 [%metadata]
 identifier:: {identifier}/req-class/datamodel/sensing
 obligation:: requirement
-
 subject:: Target Type: Data Model
 requirement:: {identifier}/req-class/datamodel/sensing/thing
 requirement:: {identifier}/req-class/datamodel/sensing/location
@@ -17,9 +19,9 @@ requirement:: {identifier}/req-class/datamodel/sensing/sensor
 requirement:: {identifier}/req-class/datamodel/sensing/observed-property
 requirement:: {identifier}/req-class/datamodel/sensing/observation
 requirement:: {identifier}/req-class/datamodel/sensing/feature  
+====
 
 
-=== Sensing Entities
 The OGC SensorThings API (2.0) standard depicts the Core Sensing entities in Figure 1  
 [#img-sta-core,link=../images/GRP0001.png]
 image::../images/GRP0001.png[Sensing Core]  
@@ -29,11 +31,10 @@ image::../images/GRP0001.png[Sensing Core]
 
 In this section, we define each entity depicted in Figure 1 and its relationships with other entities. Additionally, we also provide examples to model the entities in different contexts.  
 
-[requirements_class]
-
-==== Thing
+==== Requirement Class: Thing
 
-Requirements Class
+[requirements_class]
+.Thing
 
 ====
 [%metadata]
@@ -45,14 +46,29 @@ requirement:: {identifier}/req/datamodel/sensing/thing/relations
 ====
 
 The SensorThings API follows the ITU-T definition, i.e., with regard to the Internet of Things, a thing is an object of the physical world (physical things) or the information world (virtual things) that is capable of being identified and integrated into communication networks [ITU-T Y.2060].
+
+[example%unnumbered]
+====
+*Thing Examples*
+
+- A weather forecasting facility that houses multiple weather sensors deployed across several sites
+- A drone that mounts a LiDAR sensor for mapping purposes
+- An upstream oil well that is equipped with compound gas detection devices
+====
+
+[additional-notes]
+====
+*NOTE*: The Thing entity draws from the Host interface from the Conceptual Observation Schema in OMS
+
+====
+
 [requirement]
 ====
 [%metadata]
 identifier:: {identifier}/req/datamodel/sensing/thing/properties
 
 Each Thing entity SHALL have the mandatory properties and MAY have the optional properties listed in Table 1.
 ====
-
 [#thing-properties,reftext='{table-caption} {counter:table-num}']
 .Properties of a Thing entity
 [width="100%",cols="5,17,3,3,3",options="header"]
@@ -68,7 +84,6 @@ Each Thing entity SHALL have the mandatory properties and MAY have the optional
 ====
 [%metadata]
 identifier:: {identifier}/req/datamodel/sensing/thing/relations
-
 Each Thing entity SHALL have the direct relation between a Thing entity and other entity types listed in Table 2.
 ====