An ABL (Advanced Business Language) procedure library is a collection of r-code combined in a single file. The r-code files in a procedure library are known as members. It is similar to an object library in Windows or an archive file on UNIX. However, object libraries and archive files are used solely for efficient storage. Procedure libraries allow you to manage and execute r-code more efficiently.

Note: OpenEdge can only make use of r-code and images within a procedure library. It is technically possible to include other types of files in a procedure library. However, the user would need to extract them from the library before making use of them.