Wills as revocable, ambulatory

Article 828. A will may be revoked by the testator at any time before his death. Any waiver or restriction of this right is void. (Civil Code of the Philippines)

This means that wills are ambulatory; they may be revoked by the testator at whatever time he chooses to do so before his death. This is in line with the principle that succession opens only at the moment of death. Without death, the law on succession and the testator's will cannot be given effect.