Docket number MANDATORY in petition or complaint's caption, especially in appeal

Circular 28-91 imposes two additional requirements for petitioners filed before C or CA, to wit: (a) a requirement related to the caption of a petition, and (b) the certification of non-forum shopping. On the first requirement, the said Circular provides: "1. Caption of petition or complaint. - The caption of the petition or complaint must include the docket number of the case in the lower court or quasi-judicial agency whose order or judgment is sought to be reviewed. x x x The above rule has two (2) components: "First, the docket number of the case before the lower court whose order is sought to be reviewed, should be in the petition; and second, that docket number should be in the caption of the petition. [G.R. No. 121488. November 21, 1996]