Library Catalogs

Step 1: Define the function of an OPAC module. An OPAC (Online Public Access Catalog) is the public interface of a library's Integrated Library System (ILS). It allows users to search the library's holdings and access related services.

Step 2: Evaluate the relationship of each item to the OPAC.

Step 3: Conclude. The Catalogue Database, Dublin Core metadata, and Inter-Library Loan requests are all directly related to the functionality and content of a modern OPAC. Subscriptions are not.

Step 1: Define Web-OPAC. A Web-OPAC (Online Public Access Catalog) is a library's catalog made accessible to users through the internet.

Step 2: Identify its primary function. The fundamental purpose of any catalog, including a Web-OPAC, is to allow users to search for and locate items within the library's collection. This process of searching for and finding information is the definition of Information Retrieval.

Step 3: Differentiate from other options. Reports, Management Information Systems (MIS), and Maintenance are administrative, back-end functions for library staff. The Web-OPAC is the public-facing tool for information retrieval by patrons.