# description
Types of relationships between two goals.

# concept[].definition
Indicates that the target goal is one which must be met before striving for the current goal.

# concept[].definition
Indicates that the target goal is a desired objective once the current goal is met.

# concept[].definition
Indicates that this goal has been replaced by the target goal.

# concept[].definition
Indicates that the target goal is considered to be a "piece" of attaining this goal.

# concept[].definition
Indicates that the relationship is not covered by one of the pre-defined codes.  (An extension may convey more information about the meaning of the relationship.).