Examples of CREF in a sentence
In particular, as far as knowledgeacquisition is concerned, KEATS-1 provides a Cross Reference Editing Facility - CREF (Pitman, 1985), and a Graphical Interface System - GIS, to support the data analysis and the domain conceptualization stages of the process.
However, in terms of the CREF display, the views produced by pulling on the coloured threads are just another linear representation of the knowledge contained in the transcript and as such limit the structuring and abstraction of that knowledge.
Maps do away with the intermediate linear view of collections used in CREF and provide the knowledge engineer with an immediate high level view of the structure that s/he is building.
A simple operation such as the one described here is possible in CREF/GIS only if the knowledge engineer specifies this link indirectly, which requires a number of steps to duplicate structures across the two systems.The problems experienced in the use of CREF and GIS have caused the KEATS-1 knowledge acquisition module to be re-evaluated and have led to the design and development of Acquist, a knowledge acquisition tool to be embedded in 'KEATS-2'.
So, although CREF can be seen as a step forward from typical editors such as EMACS (Stallman, 1979), much of its user interface is still 'traditionally' teletype oriented and doesn't fully support the aforementioned threads metaphor.
These diagrams are made up of graphicalobjects that may be used to represent any type of entity, from CREF segments to objects in the domain under examination.
CREF supports this task with facilities that can be thought of metaphorically as a means of weaving arbitrary coloured threads through pieces of text (segments) and then allowing the user to pull on the threads at whim in order to obtain selective views (collections) of the transcript.
In order to help the knowledge engineer produce a conceptual model from the linguistic level structure provided by CREF, KEATS-1 provides him/her with a graphical interface tool, called GIS.
The aim of CREF is to support the knowledge engineer in the analysis of transcripts, by providing an editing facility that can help him/her impose a structure upon arbitrary pieces of text.
In the combined CREF/GIS system, this is possible only indirectly, as the two tools work with different setsof objects: segments and collections in the CREF case, graphical icons and diagrams in the GIS case.