Pattern Value Formats

Integer

An integer is a sequence of digits.

Name

A name is a sequence of letters, digits, and underscores beginning with a letter.

String

A string is a sequence of characters surrounded by single quotes or surrounded double quotes. If the string is surrounded by single quotes, it may not contain a single quote. If the string is surrounded by double quotes, it may not contain a double quote.

(TBD: escaping quotes)

Word

TBD.

Predicate Expression

The format of a predicate expression is described in Apple's "Predicate Format String Syntax".

Repeater

Repeater values have the form gn+i, where g and i are numbers, and n is a literal n.

The meanings of repeater are:

gn+i
     Divide the views into groups of size g, then select the ith of each group.

even
     is equivalent to 2n+1.

odd
     is equivalent to 2n.

Repeater Shorthand

If g is omitted, Igor uses 1. If i is omitted, Igor uses 0.

TBD: Need more description here.