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shall be applied (term WHERE). You can address three parts of a skill, its object (term
obj), subject (term subj), and/or its relation (term rel). Each addressee can be
defined using an equals-statement (=) or a like-statement (LIKE). The syntax follows
the rules of SQL. Please note that statements like DELETE, INSERT, UPDATE, or
DROP cannot be performed! All addressees and definitions can be freely combined.
Examples rules are:
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SET actionverb=’know’ WHERE *
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SET actionverb=’cite’ WHERE obj = ‘House’
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SET actionverb=’apply’ WHERE subj LIKE ‘%triangle%’
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SET actionverb=’apply’ WHERE subj LIKE ‘%triangle%’ AND
rel = ’has_side’
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SET actionverb=’apply’ WHERE subj LIKE ‘%triangle%’ OR
subj LIKE ‘%hypo%’
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SET actionverb=’apply’ WHERE (subj LIKE ‘%triangle%’ AND
obj LIKE ‘%circle%’) OR rel = ‘has_side’
By subsequently using different rules action verbs can be applied to all skills. In order
to refer to a pre-defined set of action verbs, SkOwl offers an action verb dictionary,
which can be displayed by clicking Show action verb dictionary (Fig. 2.5). By double
clicking on an action verb from the dictionary, the selected action verb is
automatically entered into the rule statement. It is not mandatory to use the action
verbs from the dictionary, one can specify and term as action verb. However, the use
of un-defined action verbs can compromise the establishment of prerequisite relations
among skills. In order to allow the user to define additional action verbs and in order
to easily refer to the most important action verbs, SkOwl offers a favorites catalogue.
This catalogue can be displayed by clicking Show action verb favorites.
By clicking the OK button the rule is applied to the available skills (indicated by
the purple arrow icon in the skill tree).
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Using the rule builder
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