Using Caché Objects - InterSystems Documentation

Caché Classes
• Class Parameters—values that customize the behavior of a class at compile time, typically
through the use of method generators.
4.1 Naming Conventions
Class and class members (referred to as identifiers) follow specific naming conventions.
These are detailed in this section.
4.1.1 General Identifier Rules
Every identifier must be unique within its context (i.e., no two classes can have the same
name).
The maximum length of the various class identifiers are listed in the following table:
Class Identifier Lengths
Identifier
Package Name
Full Class Name
Class Name
Member Name
Limits
Each package name in a project must be different somewhere in
the first 189 characters from all other packages in the namespace.
The full name of a class includes the package name, the class
name, and the period separating the package name from the
class name. It must be shorter than 220 characters.
The length of a class name is not specified. For a given package
name, the maximum length can be inferred from the preceding
rules. Each class name within a package must be uniquely
distinguished from the others in the first 60 characters.
The name of a class member (property name, method name,
index name, and so on) cannot be longer than 31 characters.
Identifiers preserve case: you must exactly match the case of a name; at the same time, two
classes cannot have names that differ only in case. For example, the identifiers “id1” and
“ID1” are considered identical for purposes of uniqueness.
Identifiers must start with an alphabetic character, though they may contain numeric characters
after the first position. Identifiers cannot contain spaces or punctuation characters with the
exception of package names which may contain the “.” character. On a Unicode system,
identifiers may contain Unicode characters.
26 Using Caché Objects