Definition of a buffer.
 A buffer is a memeber of a body and contains a number of attributes that
 is used by a specific tool, and not of public interest. The content of a
 buffer is not displayed in the object editor.
 The Buffer object reside in a class volume as a child of an ObjBodyDef object.

 Name for the element the c-struct.

 Compiled system type.

 Compiled offset in body.

 Compiled size, number of bytes.

 Bitmask for attribute properties.

 PWR_MASK_POINTER       Attribute is a pointer.
 PWR_MASK_ARRAY         Attribute is an array.
 PWR_MASK_STATE         Value will not be loaded from develompent database.
 PWR_MASK_CONST         Value is a constant.
 PWR_MASK_RTVIRTUAL     Attribute doesn't exist in runtime environment
 PWR_MASK_DEVBODYREF    Used for input and output attributes, where the
                        connection refers another object which is found
                        in the first attribute of type Objid in DevBody.
 PWR_MASK_OBJIDSELF     Contains the objects own objid. Used in timer attributes.
 PWR_MASK_NOEDIT        Value can't be changed in object editor.
 PWR_MASK_INVISIBLE     Attribute will not be displayed in object editor.
 PWR_MASK_REFDIRECT     If an AttrRef, should not give value pointed to.
 PWR_MASK_NOINVERT      Can't be inverted in plc editor.
 PWR_MASK_NOREMOVE      Can't be removed in plc editor.
 PWR_MASK_RTDBREF       Contains an rtdb reference.
 PWR_MASK_PRIVATE       Should not be interpreted by an object editor.
 PWR_MASK_ISCLASS       Attribute is specified by a class.
 PWR_MASK_SUBCLASS      ...
 PWR_MASK_BUFFER        ...
 PWR_MASK_NOWBL         Attribute will not be to printed to wb_load file.
 PWR_MASK_ALWAYSWBL     Attribute is always printed to wb_load file.

 If array, number of elements..

 Index of attribute within a body.

 Class that defines the content of the buffer.