At first glance it may seem that adding FRBR to a digital
library would be a trivial task, however this proves not to be
the case. For one, there is a need to create the underlying
FRBR data structures. Similarly, integrating a hierarchical
concept of ‘work’ into the interface sits problematically with
the existing concept of a ‘document’, and practice in physi-
cal libraries similarly catalogues different copies of the same
work or edition separately. Therefore, utilising the ‘work’
concept in the user interface will probably cause problems.