Explain the contents of an ideal catalouging code usually use in library and information centre.

A cataloging code in a library and information center typically contains the following elements:

1. Title and Author Entries: The most basic information in a cataloging code is the title of the book and the name of the author. This allows users to search for specific books or authors.

2. Subject Headings: These are used to categorize books and other materials. They help users find materials on specific topics.

3. Classification Numbers: These are used to organize materials on the shelves. They are usually based on the Dewey Decimal System or the Library of Congress Classification System.

4. Publication Information: This includes the publisher, the place of publication, and the year of publication.

5. Physical Description: This includes information about the physical characteristics of the item, such as the number of pages, the size, and the type of binding.

6. Notes: These provide additional information about the item, such as the presence of illustrations, bibliographies, or indexes.

7. Standard Numbers: These include the ISBN (International Standard Book Number) and the ISSN (International Standard Serial Number).

8. Access Points: These are the points of access to the bibliographic record, such as the title, the author, the subject, and the classification number.

9. Cross References: These guide users from one entry to another. For example, a cross reference might guide a user from a pseudonym to the author's real name.

10. Tracings: These are notes that indicate the presence of added entries for the item in the catalog. For example, a tracing might indicate that there are added entries under the author's name, the title, and the subject.

These elements together provide a comprehensive description of the item and allow users to find and access the materials they need.