gistfile1.txt

<person> := class (name: <string>, email: url.<email>, url: url.<url>,
                   gender: <gender>, dob: datetime.<date>) {
  name := name
  email := email
  url := url
  gender := gender
  dob := dob

  first-last := property {
    if (name.contains?(',')) {
      name.split(',', 1).map(:trim)
    } else {
      name.split()
    }
  }

  first-name := property {
    first-last[0]
  }

  last-name := property {
    first-last[1]
  }
}

gistfile2.txt

>>> l := [1, 2, 3, 4, 5, 6]
[1, 2, 3, 4, 5, 6]
>>> l.first
1
>>> l.rest
[2, 3, 4, 5, 6]
>>> l.+class
<list>
>>> l.rest.+class
<list>.<partial-sequence>