Update 06-other-clauses.adoc

Updated the Mermaid Class diagram to avoid the "Diamond Inheritance" problem

abstract-specification/sections/06-other-clauses.adoc

@@ -39,76 +39,60 @@ This Mermaid diagram should be converted to PlantUML for Metanorma, by replacing
 the Mermaid container with the following.
 ====
 
-[source,plantuml]
-----
+`[plantuml]
 @startuml
 .
 .
-@enduml
-----
+@enduml`
 
-[source,mermaid]
-----
+```mermaid
 classDiagram
 class ReferenceSystem {
+       <<Abstract Class>>
        Dimension 1..*
        ApplicableLocationTimeOrDomain 1
-       AuthoritativeOwnerOrDefiningBody 1
     }
-    class SpatialReferenceSystem {
-       Dimension 1..*
+class SpatialReferenceSystem {
+       <<Abstract Class>>
+       Dimension 1..3
        ApplicableLocationTimeOrDomain 1
-       AuthoritativeOwnerOrDefiningBody 1
     }
-    class TemporalReferenceSystem {
+class TemporalReferenceSystem {
+       <<Abstract Class>>
        Dimension 1
        ApplicableLocationTimeOrDomain 1
-       AuthoritativeOwnerOrDefiningBody 1
     }
-ReferenceSystem "1" <|-- "1..*" SpatialReferenceSystem
-ReferenceSystem "1" <|-- "1..*" TemporalReferenceSystem
-    TemporalReferenceSystem "0..1" <|-- "1" TemporalCoordinateReferenceSystem
-    TemporalReferenceSystem "0..1" <|-- "1" Calendar
-    TemporalReferenceSystem "0..1" <|-- "1" OrdinalTemporalReferenceSystem
+note for ReferenceSystem "Note: Has at least one of:\nSpatialReferenceSystem, or \nTemporalReferenceSystem"
+ReferenceSystem "1" o-- "0..*" SpatialReferenceSystem : has a
+ReferenceSystem "1" o-- "0..*" TemporalReferenceSystem : has a
 class TemporalCoordinateReferenceSystem {
-NameOrId
-OptionalEpochDefinedInSomeOtherTemporalReferenceSystem
-OptionalNameForEachTick
-OptionalEndTimeOrCount
-OptionalLocation
-OptionalNotation
-}
+       Dimension 1
+       ApplicableLocationTimeOrDomain 1
+    }
+class Calendar {
+       Dimension 1
+       ApplicableLocationTimeOrDomain 1
+    }
+class OrdinalTemporalReferenceSystem {
+       Dimension 1
+       ApplicableLocationTimeOrDomain 1
+    }
+note for TemporalReferenceSystem "Note: Consists of one only of:\nTemporalCoordinateReferenceSystem,\nCalendar, or \nOrdinalTemporalReferenceSystem"
+    TemporalReferenceSystem "0..1" o-- "1" TemporalCoordinateReferenceSystem : consists of
+    TemporalReferenceSystem "0..1" o-- "1" Calendar : consists of
+    TemporalReferenceSystem "0..1" o-- "1" OrdinalTemporalReferenceSystem: consists of
 TemporalCoordinateReferenceSystem "1" o-- "1" Timescale
 TemporalCoordinateReferenceSystem "1" o-- "1" Epoch
 TemporalCoordinateReferenceSystem "1" --> "1..*" Notation
-class Calendar {
-   NameOrId
-   AstronomicalAttribute [e.g. solar, sidereal, lunar, luni-solar]
-   PredictiveAttribute [e.g. observed or calculated]
-   EpochOrStartTime
-   OptionalEndTime
-   OptionalLocationOrRegionOfApplicability
-   ConstituentUnitsOrClocksAndCountsOrTimescales
-   OptionalNotation
-   }
 Calendar "1" o-- "0..1" Epoch
 Calendar "1" o-- "1..*" Timescale
 Calendar "1" o-- "1" Algorithm
 Calendar "1" --> "1..*" Notation
-class OrdinalTemporalReferenceSystem {
-    NameOrId
-    ListedOrEnumeratedSequenceOfEvents
-    FirstAndLastEvents
-    OptionalEpochDefinedInSomeOtherTemporalReferenceSystem
-    OptionalLocationOrRegionOfApplicability
-    OptionalNotations
-    }
 OrdinalTemporalReferenceSystem "1" o-- "0..1" Epoch
 OrdinalTemporalReferenceSystem "1" o-- "2..*" Event
 OrdinalTemporalReferenceSystem "1" --> "1..*" Notation
 Timescale "1" o-- "1" Clock
-----
-
+```
 
 == Temporal regimes