Difference between revisions of "RDA 2.1"

Revision as of 09:21, 2 August 2012

STEP 2.1 : BIBLIOGRAPHIC VALIDATION

bibliographic validation

Prior to beginning the RDA processing, MARS 2.0 makes sure that the bibliographic records are up to the latest AACR2 standard. Records which were cataloged using an older standard (e.g., AACR1) can be brought up to current AACR2 standards before being converted to RDA standards.

The steps taken during Bibliographic Validation are the same steps taken during our authority control processing. To find more detailed information about these steps, please review Step 2 from the MARS 2.0 Authority Control Planning Guide. Below you will find an overview of each type of change that will take place during this step as well as the corresponding page number in our MARS 2.0 Authority Control Planning Guide with more detailed information.

step 2.1 : validate 010, 020, 022, 034 fields

MARC fields that are incorrectly formatted often cause user searches to fail and prevent items in the collection from being included in the system indexes. MARS 2.0 can clean up spacing, hyphens, prefixes, and suffixes of the 010, 020, 022, and 034 fields.

step 2.2 : leader & fixed field updates

Bibliographic validation processing provides a variety of updates and corrections to values in the Leader and Fixed fields (006, 007, 008). These updates mainly consist of changing one value to another based on the type of record format (book, map, etc.).

step 2.3 : field updates &deletes

Changes to the MARC 21 communications format have made many fields obsolete. If one field has been replaced by another, the update changes the tag number. If the field has been made obsolete without being replaced, the field is simply deleted from the bib record. There are 22 fields that are changed to another field. Currently, 16 fields are removed from the bib record in this step.

step 2.4 : subfield updates & deletes

Many subfields are no longer valid within certain fields and so the subfield marker is changed from one (invalid) to another (valid). There are also a number of subfields which no longer have any corresponding use in the bib record and these are removed as part of the bibliographic validation processing. Relator term entries are included in this step. There are 15 subfields changed to another subfield, with 24 fields that have obsolete subfields removed altogether.

step 2.5 : indicator updates

In order to bring the indicators (both 1st & 2nd) in line with current MARC 21 standards, many fields in this step have their indicators changed from one value (invalid) to a specific value (valid). There are 32 fields with the 1st indicator updated and 26 fields with the 2nd indicator updated.

step 2.6 : field conversions & additions

A number of MARC update conversions are more complex than simply changing a field tag or subfield code to the current value. Some fields, such as the 007, often need to be added to a record.

Step 2.6 adds missing format data, missing subfield data, and makes complex field conversions. There are 12 fields in this step that are affected.

step 2.7 : initial article & filing indicators

MARS 2.0 supports the standard practice of omitting most initial articles even if a nonfiling character indicator has been defined for the field. Initial articles are retained, and the filing indicator correctly set, for the 245 and 440 fields.

You can also choose to have corporate heading fields checked for initial articles. This applies to the $t in the X10 fields.

There is also an extensive list of each initial article with its associated filing indicator, sorted by language.

step 2.8 : gmd standardization

MARS 2.0 also updates obsolete General Material Designations (GMD) to the current authorized form, and corrects most incorrectly spelled GMD variants. If brackets are missing, these can also be added in this step. GMD standardization also helps convert this information to the Content, Media, and Carrier types listed in Step 3 of this planning guide.

The AACR2 Standard Terms Table (Level 1 - p. 57) is used by default in this step. However, Common Terms Table (Level 2 - p. 58), andcustom options are also available, depending on your preference.

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