Question

Control fields in MARC-21 have the following : (A) Fixed length Data Elements (B) Control Number Identifier (C) Data Content (D) Physical Description Fixed Field Choose the correct answer from the options given below:

• A. (A), (B) and (D) only
• B. (A), (C) and (D) only
• C. (A), (B), (C) and (D)
• D. (B), (C) and (D) only

Hint:

Remember that MARC control fields are the "00X" fields (e.g., 001, 007, 008). They are structured, fixed-length, and full of codes for computers, unlike the variable fields (1XX, 2XX, etc.) that have textual data for humans.

Answer 1

The Correct Option is C

Step 1: Define MARC-21 Control Fields.MARC-21 control fields (tags 00X) store coded information for machine processing. These fields lack indicators and subfield codes.

Step 2: Analyze characteristics of 00X fields.\[\begin{array}{rl} \bullet & \text{(A) Fixed length Data Elements: A key feature of control fields. The 008 field, for example, contains 40 characters, each with a defined meaning.} \\ \bullet & \text{(B) Control Number Identifier: The 001 field holds the control number, a unique record identifier.} \\ \bullet & \text{(C) Data Content: Control fields always contain data, but in coded form, not as text (e.g., 'eng' for English).} \\ \bullet & \text{(D) Physical Description Fixed Field: The 007 field represents this, storing coded data on an item's physical attributes. It's a control field.} \\ \end{array}\]

Step 3: Conclusion.The listed items accurately describe characteristics and examples of control fields within the MARC-21 format.