This keyword has been replaced by the “As” syntax, described in “Working with Collections” in Using Caché Objects.
If an older class definition includes this keyword, you can import the XML form of the class definition in Studio, as described in the Import Local and Import Remote entries in the table in the “Tools Menu” section of the “Studio Menu Reference” chapter of Using Studio.
“Property Definitions” in this book
“Working with Collections” in Using Caché Objects
“Introduction to Compiler Keywords” in Using Caché Objects