Unless otherwise provided by this Revised Charter, legislation shall be published after its adoption. As used in this Section, the term "publish" shall mean to post the legislation or a summary of the legislation in at least three public places as designated by Council for a period of at least fifteen days after its adoption, and to take such other actions as provided by Council. Failure to publish legislation as required by this Section shall not invalidate the legislation, and in such event, the Clerk of Council may authorize the legislation to be published at a later date.
      The Clerk of Council shall make and retain a certificate as to the times and places by which the legislation is published. The certificate shall be prima facie evidence that the legislation was published as required by Section 4.12(a). Failure to make or retain the certificate required by this Section shall not invalidate any legislation.