On the page Visas - Traveling to Mexico from Mexico consulate website it says

Effective March 1st 2010, all visitors traveling to Mexico either by air, land or sea are required to present a valid (non-expired) Passport or Travel Document from their country to enter Mexico.

I am trying to figure out what a valid "Travel Document" is, specifically for traveling in Mexico. Obviously separate to a Passport (as that is mentioned separately), I'm wondering if this would include things like a US Passport card, SENTRI card, Enhanced Driver licenses as can be used to re-enter the US from Mexico?