project-open-data/project-open-data.github.io — pull request #356 by thecapacity (2014-09-03 15:32:09+00:00)
Title: Pedantic Proposal - Mathmatical Symbols

I would propose changing the Cardinality symbol from to , i.e. '{' or '}'.

This is because Cardinality is part of set theory: http://en.wikipedia.org/wiki/Cardinality

Where as the "( )" can be confused with inclusive|exclusive ranges:
http://stackoverflow.com/questions/4396290/what-does-this-square-bracket-and-parenthesis-bracket-notation-mean-first1-last

I will change all of them in a fork if necessary but wasn't sure if this was auto-generated documentation.