zoeken op onderwerpscode + bijbehorende specifiekere codes
voorbeeld uit Inspec database:
C7200 Information science & documentation
C7210 Information services & centres
C7210L Library automation
C7220 Generation, dissemination, & use of inform..
C7230 Publishing & reproduction
C7240 Information analysis & indexing
C7250 Information storage & retrieval
C7250C Bibliographic retrieval systems
C7250L Non-bibliographic retrieval systems
C7250N Front end systems for online searching
C7250R Information retrieval techniques
C7260 Information science education
C7290 Other aspects of information science & doc..
c72*.cc.
geeft dan de hele categorie "information science & documentation"