locale - The locale (language code) of the label. This can be set to
null if the label is not locale dependent.
resourceRole - The resource role of the XLink resource providing the label.
This can be set to null if the label does not depend on the
linkRole - The link role of the extended link network that is to be
analysed to obtain the label. This can be set to null if the
label does not depend on the link role.
the label for the aspect value based upon the given parameters,
without falling back to the label obtained by the superclass, if
no label can be obtained. If no label is obtained, a value of null