Minor refactoring

Signed-off-by: Erik Jaegervall <erik.jaegervall@se.bosch.com>

spec/units.yaml

@@ -1,11 +1,30 @@
 # This file defines units supported in the VSS standard catalog
-# So far only two domains defined, ides is to have domains for all
-# Criteria: Two units belongs to same domain if it is possible to convert
+# Ambition: Two units belongs to same domain if it is possible to convert
 # between them, either with multiplier/denominator or by custom
 # (hard-coded) function
 #
 # (However, conversion may result in out of range if target unit/datatype cannot
 # represent the value)
+#
+# Ambition when defining domains:
+#
+# A domain shall have a default unit.
+# Other units in the same name domain shall specify how to convert to default unit.
+# Either by explicitly or implicitly stating multiplier/denominator
+# or identifying that custom (hard-coded) conversion is needed
+# multiplier: x (default: 1)
+# denominator: Y (default: 1)
+# custom-conversion: true | false (default: false)
+#
+# The default unit does not need to specify any of them (i.e. use default = 1:1 mapping)
+#
+# For backward compatibility reasons defining domains should for now be optional
+# I.e. tooling shall not give an error if a domain has not been defined
+# TODO: Agree on long term standpoint of whether domains shall be required
+# Alt 1: Required for all VSS-based models, i.e. give warning today that it may become mandatory if not not defined
+# Alt 2: Required only for standard catalog (i.e. this file), i.e for now give warning if using "--strict" mode
+# Alt 3: Always keep it optional, potentially give info if using --strict mode
+
 
 domains:
   distance:
@@ -16,12 +35,16 @@ domains:
   speed:
     description: Change in distance per time unit
     default-unit: km/h
-  time:
+  point in time:
     description: Specific moment in time
     default-unit: iso8061
-  duration:
+  time:
     description: Time between two events
     default-unit: s
+  pressure:
+    description: Force applied perpendicular to the surface of an object per unit area
+    default-unit: Pa
+  # More domains to be added in similar way.
 units:
   mm:
     description: Distance measured in millimeters
@@ -49,18 +72,20 @@ units:
   inch:
     description: Distance measured in inches
     domain: distance
-    # Maybe support only integers for multiplier/denominator
+    # Maybe support only integers for multiplier/denominator, if we prefer that over 0.0254
     multiplier: 254
     denominator: 10000
     allowed-datatypes: ['numeric']
   km/h:
     description: Speed measured in kilometers per hours
     domain: speed
+    allowed-datatypes: ['numeric']
   m/s:
     description: Speed measured in meters per second
     domain: speed
     multiplier: 36
     denominator: 10
+    allowed-datatypes: ['numeric']
   m/s^2:
     description: Acceleration measured in meters per second squared
     domain: acceleration
@@ -116,47 +141,72 @@ units:
     description: Electric charge measured in ampere hours
     domain: electric charge
   ms:
-    description: Duration measured in milliseconds
-    domain: duration
+    description: Time measured in milliseconds
+    domain: time
     denominator: 1000
+    allowed-datatypes: ['numeric']
   s:
-    description: Duration measured in seconds
-    domain: duration
+    description: Time measured in seconds
+    domain: time
+    allowed-datatypes: ['numeric']
   min:
-    description: Duration measured in minutes
-    domain: duration
+    description: Time measured in minutes
+    domain: time
     multiplier: 60
+    allowed-datatypes: ['numeric']
   h:
-    description: Duration measured in hours
-    domain: duration
+    description: Time measured in hours
+    domain: time
     multiplier: 3600
+    allowed-datatypes: ['numeric']
   day:
-    description: Duration measured in days
-    domain: duration
+    description: Time measured in days
+    domain: time
     multiplier: 86400
+    allowed-datatypes: ['numeric']
   weeks:
-    description: Duration measured in weeks
-    domain: durtaion
+    description: Time measured in weeks
+    domain: time
     multiplier: 604800
+    allowed-datatypes: ['numeric']
   months:
-    description: Duration measured in months
-    domain: duration
+    description: Time measured in months
+    domain: time
     # Multiplier based on 30 day month
     multiplier: 2592000
+    allowed-datatypes: ['numeric']
   years:
-    description: Duration measured in years
-    domain: duration
+    description: Time measured in years
+    domain: time
     # Multiplier based on 365 day year
     multiplier: 31536000
+    allowed-datatypes: ['numeric']
+  iso8061:
+    description: Point in time expressed as string according to ISO 8601
+    domain: point in time
+    allowed-datatypes: ['string']
+    # Special conversion method 1so8601 -> timestamp needed
+  UNIX Timestamp:
+    description: Unix time is a system for describing a point in time. It is the number of seconds that have elapsed since the Unix epoch, excluding leap seconds.
+    domain: point in time
+    # Conversion custom , i.e this file does not specify how conversion to iso8061 happens
+    conversion: custom
+    allowed-datatypes: ['uint32','uint64','int64']
   mbar:
     description: Pressure measured in millibars
     domain: pressure
+    multiplier: 100
   Pa:
     description: Pressure measured in pascal
     domain: pressure
   kPa:
     description: Pressure measured in kilopascal
     domain: pressure
+    multiplier: 1000
+  psi:
+    description: Pressure measured in pounds per square inch
+    domain: pressure
+    multiplier: 6894.7572931783
   stars:
     description: Rating measured in stars
     domain: rating
@@ -220,17 +270,3 @@ units:
   Wh/km:
     description:  Energy consumption per distance measured in watt hours per  kilometer
     domain: energy consumption per distance
-  psi:
-    description: Pressure measured in pounds per square inch
-    domain: pressure
-  iso8061:
-    description: Time expressed as string according to ISO 8601
-    domain: time
-    allowed-datatypes: ['string']
-    # Special conversion method 1so8601 -> timestamp needed
-  timestamp:
-    description: Unix time is a system for describing a point in time. It is the number of seconds that have elapsed since the Unix epoch, excluding leap seconds.
-    domain: time
-    # Conversion custom , i.e this file does not specify how conversion to iso8061 happens
-    conversion: custom
-    allowed-datatypes: ['uint32','uint64','int64']