Defining execution procedures

An OSA defines ``execution procedures'' that can be performed on the objects or attributes of a class. The presentation level of a SCOadmin manager calls these procedures with arguments specifying affected object instances and attributes, data values, and other relevant informations. The procedures should return appropriate data and error messages to the calling routine.

There are only 10 possible operation types:

for attributes only	for objects only
get	delete
replace	action
replaceWithDefault	create
add	list
remove
filter

The possible operations are divided into two categories; those that work on the object's attributes, and those that work on the object as a whole. For each object and attribute, the class definition tables specify which procedures may act on the object or attribute.

Execution procedures can be split into four types of functions:

• Application procedures

• Filter procedures

• List procedures

• Helper procedures