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Most of the default query classes are designed to support some specific
interaction with the user within the Prolog development environment. The
full list of query classes can be inspected in the file
library('SU_messages'). Here, we only describe the two classes
defined by 'SU_messages':query_class/5 that may be of general
use:
| QueryClass | yes_or_no | yes_no_proceed |
| Prompt | ' (y or n) ' | ' (y, n, p, s, a, or ?) ' |
| InputMethod | line | line |
| MapMethod | char([yes-"yY", no-"nN"]) | char([yes-"yY", no-"nN", proceed-"pP", suppress-"sS", abort-"aA"]) |
| FailureMode | help_query | help_query |