BLI 223 Solved Guess Paper for December 2026: Organising and Managing Information, IGNOU Bachelor of Library and Information Science (BLIS)

Arrays and the canons for their formation in the Idea Plane

Question: What is an array? State with examples the canons for the formation of arrays of classes in the Idea Plane.

An array is a long line of entities of equal rank arranged in some systematic order.

The Idea Plane is the plane of foremost importance, where the core intellectual work of classification is done. Ranganathan gave five sets of canons for this plane: Canons of Characteristics, Canons for Succession of Characteristics, Canons for Formation of Arrays of Classes, Canons for Formulation of Chains of Classes and Canons for Filiatory Sequence. All the children of a father make an array. So do all the continents of the earth, and all the states of India.

Canons for formation of arrays of classes

1. Canon of Exhaustiveness: An array should include all its eligible members. The array whites, blacks, brown is not exhaustive, because it leaves out pale yellow, fair and wheatish.
2. Canon of Exclusiveness: An entity should belong to one and only one array. Dogs should be kept either under mammals or under pets, not both, otherwise cross classification results. In computerised databases and OPACs, however, cross classification is a boon because it gives extra access points.
3. Canon of Helpful Sequence: Entities should be placed in a logical, predictable and helpful order. All the children of a father can be arranged by age.
4. Canon of Consistent Sequence: If a set of entities occurs at different places, the order should be the same everywhere. Male, female and child occur in Psychology, Education and even Law, and their sequence should match in all of them.

Principles of helpful sequence

1. Chronological: Prime Ministers as Nehru, Shastri, Indira Gandhi, Morarji Desai.
2. Later in Evolution: Animals from amoeba to mammals; plants from Thallophyta to Dicotyledons.
3. Spatial Contiguity: J and K, Punjab, Himachal, Haryana, Delhi, UP.
4. Quantitative Measure: One-rupee, two-rupee, five-rupee notes up to one-thousand-rupee notes.
5. Increasing Complexity: Syllable, word, phrase, clause, sentence, paragraph.
6. Popularity of Use: Food seeds arranged as rice, wheat and rye.
7. Canonical Sequence: The traditional order, as in Sita-Ram, never Ram-Sita.
8. Alphabetical Order: Used only when nothing else applies; Ranganathan treats it as the least preferred method.

Conclusion: An array holds equals in a helpful line. Exhaustiveness and exclusiveness keep it complete and clean, while helpful and consistent sequence make it easy to predict and use.

MARC: history and the structure of a MARC-21 record

Question: What is MARC? Write in brief its history and state the structure of a MARC-21 record.

A MARC record is a Machine-Readable Cataloging record.

MARC is a format standard for storing and exchanging bibliographic records in machine-readable form. A record carries the description of the item, main and added entries, subject headings and the call number.

History in brief

In the 1960s the Library of Congress designed the format to produce printed cards, and a pilot project called MARC I tested it. UKMARC was developed in parallel. In 1977 IFLA developed UNIMARC to exchange records between national MARCs, and USMARC and CANMARC were later harmonised as MARC 21.

Structure of a MARC record

1. Leader: The first 24 characters. It gives the total length, the type of record code and the bibliographic level.
2. Record Directory: Follows the leader and names each variable field and its position, with a 12-character entry each.
3. Variable Fields: Fields 001 to 009 (00X) are control fields; all others are data fields.
4. Tags and Indicators: Each field has a tag followed by two indicator positions with values 0 to 9; an unused indicator is shown by #.
5. Subfields: Each subfield code is lower case and preceded by a delimiter. In 260 ## $a New Delhi : $b Allied Publishers, $c 2001, the $ is the delimiter.

Conclusion: MARC prevents duplication of work, allows sharing of resources and gives bibliographic control at the international level.

Recall, precision and the criteria for evaluating an indexing system

Question: Explain the concepts of Recall and Precision. State the criteria for evaluating an indexing system.

Recall refers to the index's ability to let relevant documents through the filter.

Evaluation measures an indexing system's retrieval efficiency for users and its operating efficiency for managers. Effectiveness is how far the system meets its objectives, measured by recall and precision; efficiency is how economically it does so. Experimental evaluation traces back to the Cranfield experiments, which ran from 1958 to 1966.

Recall and precision

1. Recall ratio: Relevant documents retrieved divided by total relevant documents available, multiplied by 100 (R / C × 100). It measures completeness.
2. Precision ratio: The ability to hold back non-relevant documents. Relevant documents retrieved divided by total documents retrieved, multiplied by 100 (R / L × 100).
3. The matrix: Hits are relevant documents retrieved, noise is irrelevant documents retrieved, misses are relevant documents not retrieved, and dodged are non-relevant documents correctly rejected.
4. Inverse relation: 100 per cent recall and precision together are not possible. Broadening a search raises recall and lowers precision.

Criteria given by Cleverdon

C.W. Cleverdon (1966) named six criteria: recall, precision, time lag between request and result, user effort, form of presentation of output, and coverage of the collection.

Conclusion: Recall tells you how much wanted material came out; precision tells you how clean it was. A system is judged by the balance between the two.

OPAC: features, working and advantages over a manual catalogue

Question: What is an OPAC? State its features and working, and its advantages over a manual catalogue.

Computer terminal at user end providing a friendly interface for searching, retrieving and viewing the machine-readable cataloguing data in eye-readable text format.

Web 2.0 technology helped separate the user interface from the back-end systems of a library. The IGNOU block cites an OCLC survey of 396 college students from six countries: 89 per cent began their search on a search engine and only 1 per cent on a library catalogue.

Search tools of the new generation OPAC

1. Relevance ranking: The best items rise to the top; users may also sort by title, author or date.
2. Faceted navigation: Users drill down from broad results using facets drawn from metadata such as names and subject headings.
3. Clustering: Results are grouped by subject, author, genre, format or date.
4. Breadcrumbs: Contextual links let the user step back and choose another facet.
5. Search result data: The interface shows the up-to-the-minute status of each item.

Next generation interfaces include Endeca, Encore, eXtensible Catalogue, AquaBrowser Library and Koha.

Advantages over a manual catalogue

It is updated quickly, searches any bibliographic element such as author or subject, allows new access points, makes a union catalogue possible and shows whether an item is on the shelf or on loan.

Conclusion: The OPAC is the face of the online catalogue. Its strength lies in speed, many access points and a familiar web-like search.

Metadata: definition, types and the Dublin Core record

Question: Define metadata. State its types. List the elements of a Dublin Core Metadata Record.

Metadata is data about data. It is a structured set of data which describes the various characteristics of an object or document.

Metadata is information about an information resource, which may be a web page, image, dataset or any other physical or electronic resource. Structured metadata makes objects easy to discover. In library practice the catalogue itself is metadata, because it describes the items a library holds. Common schemas include AACR2, MARC21, GILS, EAD and Dublin Core.

Types of metadata

1. Administrative: Covers the life cycle of a document: ordering, acquisition, maintenance, licensing, rights, ownership and provenance.
2. Technical: Stores file type, content type, rendering details and size; helps in migration, refreshing and checking the integrity of the object.
3. Structural: A structural map explains the components of an object, its sections and sub-sections, and how they relate.
4. Descriptive: Describes documents in a library, as in AACR2 and MARC21. For web location MARC21 uses field 856 and Dublin Core uses the Identifier element.
5. Preservation: Supports digital longevity by recording preservation conditions and original features. PREMIS (Preservation Metadata: Implementation Strategies), a joint venture of OCLC and RLG, is the standard set; the IGNOU block describes version 2.0.

Dublin Core metadata record

Dublin Core, maintained by the Dublin Core Metadata Initiative (DCMI), is a 15-element set built to help discovery of electronic resources. The specimen record in the IGNOU block shows these values:

Conclusion: Its five types look after the life, form, structure, description and preservation of a document, and Dublin Core, with 15 elements, is the most widely used schema for electronic resources.