(a) No action or proceeding is open to objection on the ground that a merely declaratory judgment or order is sought thereby. The court may, in cases of actual controversy, make binding declarations of rights, having the force of final judgments, whether or not any consequential relief is or could be claimed, including the determination, at the instance of anyone interested in the controversy, of the construction of any statute, municipal ordinance, or other governmental regulation, or of any deed, will, contract or other written instrument, and a declaration of the rights of the parties interested. The foregoing enumeration does not exclude other cases of actual controversy. The court shall refuse to enter a declaratory judgment or order, if it appears that the judgment or order, would not terminate the controversy or some part thereof, giving rise to the proceeding. In no event shall the court entertain any action or proceeding for a declaratory judgment or order involving any political question where the defendant is a State officer whose election is provided for by the Constitution; however, nothing herein shall prevent the court from entertaining any such action or proceeding for a declaratory judgment or order if such question also involves a constitutional convention or the construction of a statute involving a constitutional convention.
     (b) Declarations of rights, as herein provided for, may be obtained by means of a pleading seeking that relief alone, or as incident to or part of a complaint, counterclaim or other pleading seeking other relief as well, and if a declaration of rights is the only relief asked, the case may be set for early hearing as in the case of a motion.
     (c) If further relief based upon a declaration of right becomes necessary or proper after the declaration has been made, application may be made by petition to any court having jurisdiction for an order directed to any party or parties whose rights have been determined by the declaration to show cause why the further relief should not be granted forthwith, upon reasonable notice prescribed by the court in its order.
     (d) If a proceeding under this Section involves the determination of issues of fact triable by a jury, they shall be tried and determined in the same manner as issues of fact are tried and determined in other civil actions in the court in which the proceeding is pending.
     (e) Unless the parties agree by stipulation as to the allowance thereof, costs in proceedings authorized by this Section shall be allowed in accordance with rules. In the absence of rules the practice in other civil actions shall be followed if applicable, and if not applicable, the costs may be taxed as to the court seems just.