Actor, Constraint, Interface, Value Type, Enum
Blocks function like Classes in object-oriented coding languages. In this metaphor, the most generic class is simply Block. SysML enables you to create your own custom extensions of Blocks, but also provides many standard ones out of the box. All blocks contain a name.
This is an incomplete list.
Actor
Represents an agent. Has no other special properties.
Constraint
Represents a constraint that can be bound to other blocks.
Contains a constraint expression, and constraint parameters.
Interface
Represents a behavioral contract that can be used to decouple blocks from their relationships. They describe what configurations the block can receive or provide.
Contains operations and receptions.
ValueType
Represents a type of value that a can be reused to type block properties. For example, you may have a ValueType for DateTime. SysML comes pre-built with a library of base ValueTypes.
May contain additional values elements, if the ValueType represents a Tuple.
Enumeration
Represents a bound set of values that a can be used to type properties. Similar to ValueType, but with a more specific use case. An Enumeration could be built to type a DayOfWeek property, where the only values are [’monday’, ‘tuesday’, … ‘sunday’].
Contains the enumeration Literals.