The California Supreme Court on Amendment vs. Revision:

Under the California Constitution, the initiative can be used for constitutional "amendments" but not constitutional "revisions"; see this post for more, including the constitutional text that strongly suggests this. Here's the California Supreme Court's explanation for why Prop. 8 is a constitutionally permissible "amendment" and not an impermissible "revision" (all emphases in original):

"[O]ur analysis in determining whether a particular constitutional enactment is a revision or an amendment must be both quantitative and qualitative in nature. For example, an enactment which is so extensive in its provisions as to change directly the 'substantial entirety' of the Constitution by the deletion or alteration of numerous existing provisions may well constitute a revision thereof. However, even a relatively simple enactment may accomplish such far reaching changes in the nature of our basic governmental plan as to amount to a revision also. In illustration, the parties herein appear to agree that an enactment which purported to vest all judicial power in the Legislature would amount to a revision without regard either to the length or complexity of the measure or the number of existing articles or sections affected by such change." ...

From a quantitative standpoint, it is obvious that Proposition 8 does not amount to a constitutional revision. The measure adds one 14-word section to article I -- a section that affects two other sections of article I by creating an exception to the privacy, due process, and equal protection clauses contained in those two sections as interpreted in the majority opinion in the Marriage Cases. Quantitatively, Proposition 8 unquestionably has much less of an effect on the preexisting state constitutional scheme than virtually any of the previous constitutional changes that our past decisions have found to constitute amendments rather than revisions....

[As to the qualitiative prong of the amendment/revision analysis,] the numerous past decisions of this court that have addressed this issue all have indicated that the type of measure that may constitute a revision of the California Constitution is one that makes "far reaching changes in the nature of our basic governmental plan," or, stated in slightly different terms, that "substantially alter[s] the basic governmental framework set forth in our Constitution." ... Proposition 8 works no such fundamental change in the basic governmental plan or framework established by the preexisting provisions of the California Constitution -- that is, "in [the government's] fundamental structure or the foundational powers of its branches." ...

Again, strikes me as quite correct.