04/02/2020 E-Library - Information At Your Fingertips: Printer Friendly The option granted under this section shall be exercised within twenty (20) years from the approval of this Act."[196] ICCs/IPs are given the option to secure a torrens certificate of title over their individually-owned ancestral lands. This option is limited to ancestral lands only, not domains, and such lands must be individually, not communally, owned. Ancestral lands that are owned by individual members of ICCs/IPs who, by themselves or through their predecessors-in-interest, have been in continuous possession and occupation of the same in the concept of owner since time immemorial[197] or for a period of not less than 30 years, which claims are uncontested by the members of the same ICCs/IPs, may be registered under C.A. 141, otherwise known as the Public Land Act, or Act 496, the Land Registration Act. For purposes of registration, the individually-owned ancestral lands are classified as alienable and disposable agricultural lands of the public domain, provided, they are agricultural in character and are actually used for agricultural, residential, pasture and tree farming purposes. These lands shall be classified as public agricultural lands regardless of whether they have a slope of 18% or more. The classification of ancestral land as public agricultural land is in compliance with the requirements of the Public Land Act and the Land Registration Act. C.A. 141, the Public Land Act, deals specifically with lands of the public domain.[198] Its provisions apply to those lands "declared open to disposition or concession" x x x "which have not been reserved for public or quasi-public purposes, nor appropriated by the Government, nor in any manner become private property, nor those on which a private right authorized and recognized by this Act or any other valid law x x x or which having been reserved or appropriated, have ceased to be so."[199] Act 496, the Land Registration Act, allows registration only of private lands and public agricultural lands. Since ancestral domains and lands are private, if the ICC/IP wants to avail of the benefits of C.A. 141 and Act 496, the IPRA itself converts his ancestral land, regardless of whether the land has a slope of eighteen per cent (18%) or over,[200] from private to public agricultural land for proper disposition. The option to register land under the Public Land Act and the Land Registration Act has nonetheless a limited period. This option must be exercised within twenty (20) years from October 29, 1997, the date of approval of the IPRA. Thus, ancestral lands and ancestral domains are not part of the lands of the public domain. They are private and belong to the ICCs/IPs. Section 3 of Article XII on National Economy and Patrimony of the 1987 Constitution classifies lands of the public domain into four categories: (a) agricultural, (b) forest or timber, (c) mineral lands, and (d) national parks. Section 5 of the same Article XII mentions ancestral lands and ancestral domains but it does not classify them under any of the said four categories. To classify them as public lands under any one of the four classes will render the entire IPRA law a nullity. The spirit of the IPRA lies in the distinct concept of ancestral domains and ancestral lands. The IPRA addresses the major problem of the ICCs/IPs which is loss of land. Land and space are of vital concern in terms of sheer survival of the ICCs/IPs.[201] elibrary.judiciary.gov.ph/thebookshelf/showdocsfriendly/1/36882 40/148