As used in this subchapter, unless the context otherwise indicates, the following terms have the following meanings.
1. Petitioner. "Petitioner" means a person who seeks enforcement of an order for return of a child under the Hague Convention on the Civil Aspects of International Child Abduction or enforcement of a child custody determination.
2. Respondent. "Respondent" means a person against whom a proceeding has been commenced for enforcement of an order for return of a child under the Hague Convention on the Civil Aspects of International Child Abduction or enforcement of a child custody determination.