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#### 34.6.2 Properties

All class properties must be defined within `properties` blocks. The definition of a default value for a property is optional and can be omitted. The default initial value for each class property is `[]`.

A `properties` block can have additional attributes to specify access rights or to define constants:

    classdef some_class
      properties (Access = mode)
        prop1
      endproperties

      properties (SetAccess = mode, GetAccess = mode)
        prop2
      endproperties

      properties (Constant = true)
        prop3 = pi ()
      endproperties

      properties
        prop4 = 1337
      endproperties
    endclassdef

where mode can be one of:

`public`

  The properties can be accessed from everywhere.

`private`

  The properties can only be accessed from class methods. Subclasses of that class cannot access them.

`protected`

  The properties can only be accessed from class methods and from subclasses of that class.

When creating an object of `some_class`, prop1 has the default value `[]` and reading from and writing to prop1 is defined by a single mode. For prop2 the read and write access can be set differently. Finally, prop3 is a constant property which can only be initialized once within the `properties` block.

By default, in the example prop4, properties are not constant and have public read and write access.