Actually I can't seem to find that document that a Altera forum member wrote, I also couldn't readily find my copy of the pdf...
I did find the following:
https://www.altera.com/literature/manual/mnl_timequest_cookbook.pdf
and what looks like something that might help write sdc (a.k.a. xdc) files.
Took a bit of searching but found it. . It's basically a user guide for TimeQuest but as timequest uses SDC and the doc describes how to use TimeQuest to enter constraints...so you get to see how to constrain a design, which can be applied to Xilinx Vivado as well.