Eoin Ó Broin (Dublin Mid West, Sinn Fein) | Oireachtas source

I have a technical question on this section. The section relates to variations affecting settlement-specific objectives in an urban area or priority area plan. I do not understand why this section is separate from section 56. Is there a reason it is a stand-alone section? What is the import of its provisions being separate as opposed to being included in the general terms of the preceding section?