Attribute definition table (ADT)

An attribute definition table defines for each attribute a token to reference the attribute by, sets of valid operations and filters that may be performed on the attribute, and the attribute's value structure.

Attribute definition table

enabled	ATTR_ENABLED	get	eq	single string
gid	1	get add remove	eq present	set integer
level	100	get replace replaceWithDefault	eq le ge	single integer
priority	ATTR_PRIORITY	get replace	eq	single double

1st column: name

made up of characters [a-z_]* and used by the Server API to identify the attribute.

2nd column: token

an integer used by the Server API and OSAs to reference the attribute. Identifiers can be in any order and in any positive range (negative integers are reserved for error conditions; zero is reserved for the NULL token). In languages (such as Tcl) which have only the string data type, the token is identical to the name.

3rd column: valid operations

all operations that may be performed on the attribute. Can include: get, replace, replaceWithDefault, add, remove, create. (create is always allowed to include any attribute, so it is implied to be listed for every attribute.)

4th column: valid filters

all filters that may process the attribute. Can include: eq, le, ge, subset, superset, present, intersect.

5th column: value structure

(set|single) (string|integer|double) Identifies for OSAs and Server API how the value(s) paired with attribute should be interpreted. In Tcl every data type is a string, so the CDT does not specify the data type for this pair of values. In C/C++, strings are represented as char *, integers as long, and floating point numbers as doubles.

For more information, see ``Example Attribute Definition Tables (ADT)''.