2. Medical Subject Headings (MeSH) Changes after 1999 Dr. Yan Ma

3. Topical Subheadings They are same as we discussed in earlier slide presentation.

4. Pre-1999 Subheading String and New Practice Pre-1999 650_ 2 Main heading |x topical subheading |z geographic |v form |x language New Practice: 650_ 2 Main heading |x topical subheading 651_ 2 Geographic |x topical subheading 655_ 7 Genre or publication type |2 mesh

5. Publication Type Publication type: These descriptors characterize what a publication is rather than what it is about. See the list of publication types.

6. Publication Type How do we use it in cataloging? NLM’s new practice: 655_ 7 Congresses |2 mesh 655_7 Atlases |2 mesh 655_7 Bibliography |2 mesh

7. Publication Type How do we use it in cataloging? In OCLC: The publication type is in the |v subfield code. For example: 650_2 Neoplasms |v Congresses. 650_2 Neoplasms |v Bibliography.

8. Form Subheading or Physical Carrier The physical carrier such as CD-ROM, videocassettes,etc. is not considered to be a genre or publication type. The physical carrier is identified in the bibliographic description, notes and the fixed field.

9. Form Subheading or Physical Carrier They are coded in 300, 500, fixed field. There is no rule on how to put a note for the physical carrier. In Practice: Many libraries decided to continue their conventional practice.

10. Form Subheading or Physical Carrier Video Recording in MeSH is a main heading. It is used to describe the main topic of the item. It is not used for subheadings. /videocassettes is a subheading in MeSH. Can we still use it? Yes. But, it is not listed in a single form subheading list in the beginning of the MeSH list.

11. Language Subheading Language is coded in 008/35-37. It is MARC21) In OCLC, we use 041 for language and fixed field.

12. Geographic Subheading Geographic subheading is stored in 651. The two topical subheadings ethnology and epidemiology are retained for use with geographic names and stored in the |x subfield of the 651. 651_2 Texas |x epidemiology.

13. Age Groups When a record contains age group terms and the subject terms are to be qualified by an age group, a |9 a subfield is added.

14. Age Groups Old Practice: 650 12 Child Development 650 22 Communication |x in infancy & childhood 650 22 Learning |x in infancy & childhood 650 22 Thinking |x in infancy & childhood

15. Age Groups New Practice: 650 12 Child Development 650 22 Communication |9 a 650 22 Learning |9 a 650 22 Thinking |9 a 650 22 Infant 650 22 Child

16. Age Groups In COLC, it is translated into this: 650 12 Child Development 650 22 Communication |x Infant 650 22 Communication |x Child 650 22 Learning |x Infant 650 22 Learning |x Child 650 22 Thinking |x Infant 650 22 Thinking |x Child

17. MeSH Application Application of MeSH for Medical Catalogers: http://www.nlm.nih.gov/tsd/cataloging/catmesh.html