Volume 2 Chapter 11 Text Menu *QUALIFIER

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*REFCODE

Function

*REFCODE is used to test for entries having a specified reference code.

CSD Contents

To each database entry we assign a "label", known as the reference code, or simply refcode.

The refcode consists of six alphabetic characters which "define" the chemical compound and a possible further two numeric digits which "trace the publication history".

The six alphabetic characters have a role which is similar to the Chemical Abstracts Service Registry Number.

Example: Consider a series of publications on the structure of compound Z :

(i)
X-ray study of monoclinic form, published in 1982 by Smith
(ii)
X-ray study of tetragonal form,published in 1983 by Smith
(iii)
more detailed publication of results of (ii), published in 1984 by Smith
(iv)
neutron study at room temperature of monoclinic form, published in 1984 by Brown
(v)
neutron study at low temperature of monoclinic form, published in 1984 by Brown

Suppose database entry (i) has refcode PASDEA

Then (ii)-(v) have refcodes PASDEA01, PASDEA11, PASDEA02, PASDEA03

Entries PASDEA11 and PASDEA01 are "linked" in that PASDEA11 "supersedes" PASDEA01.

We refer to the "family" of entries which are tied together by the common 6-letter code.

In the database entries are ordered alphanumerically by refcode and thus all members of a refcode family are clustered together.

It should be noted that stereoisomers of a compound are assigned different 6-letter codes; likewise for deuterated analogues of the normal hydrogen species.

Graphics QUEST3D Procedure

Select *REFCODE from the TEXT sub-menu and respond to the standard text prompts.

Basic QUEST Procedure

Ex.1

T1 *REFC ABCDEF01

This will register a hit for the entry having refcode ABCDEF01

Ex.2

T1 *REFC ABCDEF

Since reference code searching is a text search this test will register hits for all members of the ABCDEF refcode family

ie. ABCDEF, ABCDEF01, ABCDEF02, ABCDEF10, ABCDEF11, etc.

Related Keywords

*PREFCODE, BEGIN-AT-REFCODE, RETRIEVE (both in SEARCH menu)

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Volume 2 Chapter 11 Text Menu *REMARKS.