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== Format Designation in MARC Records: A Trip Down the Rabbit-Hole ==

This presentation will use a seemingly simple data point, the "format" of the item being described, to illustrate some of the complexities and challenges inherent in the parsing of MARC records. I will talk about abstract vs. concrete forms; format designation in the Leader, 006, 007, and 008 fixed fields as well as the 245 and 300 variable fields; pseudo-formats; what is mandatory vs. optional in respect to format designation in cataloging practice; and the differences between cataloging theory and practice as observed via format-related data mining of a mid-size academic library collection.