message: BIS Schema validation documentation update
  ExtendedTypes of Properties now validating
  Moved "properties should not be of type long" into properties section (was in entityclass)
  Related work items:
diff: @@ -39,7 +39,6 @@ The rules are broken into the different parts of the Schema they are validated a
  - Entity classes may only derive from one base Entity class.
  - Entity classes may not inherit a property from more than one base class.
  - A mixin property cannot override an Entity property inherited from a base Entity class.
  -- Properties should not be of type **long**. These properties should be navigation properties if they represent a FK or be of type **int** or **double** if they represent a number.
  - If any aspect (ECClass which derives from **ElementMultiAspect**) exists, there must be a relationship that derives from the **ElementOwnsMultiAspects** relationship with this class supported as a target constraint.
  - If any aspect (ECClass which derives from **ElementUniqueAspect**) exists, there must be a relationship that derives from the **ElementOwnsUniqueAspect** relationship with this class supported as a target constraint.
  - Entity classes cannot implement both **bis:IParentElement** and **bis:ISubModeledElement**.
  @@ -78,4 +77,9 @@ The rules are broken into the different parts of the Schema they are validated a
  ### Properties
  +- Properties should not be of type **long**. These properties should be navigation properties if they represent a FK or be of type **int** or **double** if they represent a number.
  - Properties within the same class and category cannot have the same display label.
  +- Properties must use the following supported ExtendedTypes:
  + - **BeGuid**
  + - **GeometryStream**
  + - **Json**
  \ No newline at end of file
  