バージョン：25.2

symbol colon

used in property list between keys and values

  set view to {sky:"blue", terrain:"hilly", plants:"sparse"}

  set redactions to {:} -- an empty property list

used between parameter variable names and their default values (new in 2.02)
- Examples:
```
  to updateReport with balance:0, increment:10
```
used optionally in non-function handler before formal parameters
- Examples:
```
  to handle simplifiedValue: numerator, denominator
```
used in square bracket function syntax before arguments
- Examples:
```
  put [connection sendMsg:"update", 44]
```