RE: datatype comparisons and arithmetic conversions

From: Mike Dean ([email protected])
Date: 01/06/04

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Here are updates to my previous examples from [1] based on our 16
December telecon:

  <!-- free shipping on orders over $50 -->
  <ruleml:imp>
    <ruleml:_body>
      <swrlx:classAtom>
        <owlx:Class owlx:name="Order"/>
        <ruleml:var>order</ruleml:var>
      </swrlx:classAtom>
      <swrlx:datavaluedPropertyAtom swrlx:property="cost">
        <ruleml:var>order</ruleml:var>
        <ruleml:var>cost</ruleml:var>
      </swrlx:datavaluedPropertyAtom>
      <swrlx:operationAtom swrlx:op="&op;numeric-greater-than">
        <ruleml:var>cost</ruleml:var>
        <owlx:DataValue owlx:datatype="&xsd;integer">50</owlx:DataValue>
      </swrlx:comparisonAtom>
    </ruleml:_body>
    <ruleml:_head>
      <swrlx:datavaluedPropertyAtom swrlx:property="shipping">
        <ruleml:var>order</ruleml:var>
        <owlx:DataValue owlx:datatype="&xsd;integer">0</owlx:DataValue>
      </swrlx:datavaluedPropertyAtom>
    </ruleml:_head>
  </ruleml:imp>

  <!-- convert temperature from Fahrenheit to Celsius -->
  <ruleml:imp>
    <ruleml:_body>
      <swrlx:datavaluedPropertyAtom swrlx:property="fahrenheitTemp">
        <ruleml:var>x</ruleml:var>
        <ruleml:var>f</ruleml:var>
      </swrlx:datavaluedPropertyAtom>
      <swrlx:operationAtom swrlx:op="&op;numeric-subtract">
        <ruleml:var>i1</ruleml:var>
        <ruleml:var>f</ruleml:var>
        <owlx:DataValue owlx:datatype="&xsd;integer">32</owlx:DataValue>
      </swrlx:operationAtom>
      <swrlx:operationAtom swrlx:op="&op;numeric-multiply">
        <ruleml:var>i2</ruleml:var>
        <ruleml:var>i1/ruleml:var>
        <owlx:DataValue owlx:datatype="&xsd;integer">5</owlx:DataValue>
      </swrlx:operationAtom>
      <swrlx:operationAtom swrlx:op="&op;numeric-integer-divide">
        <ruleml:var>c</ruleml:var>
        <ruleml:var>i2/ruleml:var>
        <owlx:DataValue owlx:datatype="&xsd;integer">9</owlx:DataValue>
      </swrlx:operationAtom>
    </ruleml:_body>
    <ruleml:_head>
      <swrlx:datavaluedPropertyAtom swrlx:property="celsiusTemp">
        <ruleml:var>x</ruleml:var>
        <ruleml:var>c</ruleml:var>
      </swrlx:datavaluedPropertyAtom>
    </ruleml:_head>
  </ruleml:imp>

This assumes that the binding pattern for each "operator" will be
defined in our documentation - implementations may also allow
user-defined operators.  By convention, the arithmetic operators use
the first binding for the result of the calculation.  Each operator
will also return true or false to indicate the success or failure of
the swrlx:operationAtom (false might be used in the arithmetic
operators to report overflow, divide by zero, etc.).

Since swrlx:operationAtom can return false, it should only appear
within ruleml:_body.

Corresponding executable examples in N3 are now available at [2] and [3].

	Mike

[1] http://www.daml.org/listarchive/joint-committee/1580.html

[2] http://www.daml.org/2003/06/ruletests/comparison-1.n3

[3] http://www.daml.org/2003/06/ruletests/translation-4.n3

Next message: Mike Dean: "RE: datatype comparisons and arithmetic conversions"
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