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<ruleService
        name="HealthCareService"
        xmlns="http://wso2.org/carbon/rules"
        targetNamespace="http://com.test/HeathCareService">
    <ruleSet>
        <rule resourceType="regular" sourceType="inline">
            <![CDATA[
                package HeathCareService

                import samples.heathcare.Patient;
                import samples.heathcare.Dose;

                rule "Rule one" no-loop true
                when
                    Patient( ( medication in ( "Amoxicillin", "Cefuroxime", "Levofloxacin" ) ) && ( ( age  > 16 ) && ( age < 60 ) ) && ( creatinineLevel == 0 )  )
                then
                    Dose msg = new Dose();
                    msg.setMessage("500 mg every 24 hours for 14 days");
                    insertLogical(msg);
                end

                rule "Rule two" no-loop true
                when
                    Patient( ( medication in ( "Amoxicillin", "Cefuroxime", "Levofloxacin" ) ) && ( ( age  > 16) && ( age < 60 ) ) && ( ( creatinineLevel > 0 ) &&  ( creatinineLevel < 1.5 ) ) )
                then
                    Dose msg = new Dose();
                    msg.setMessage("250 mg every 24 hours for 14 days");
                    insertLogical(msg);
                end
            ]]>
        </rule>
    </ruleSet>
    <operation name="recommendDose">
        <input wrapperElementName="patientDetail" namespace="http://com.test/patientDetail">
            <fact elementName="patientDetail" namespace="http://com.test/patientDetail" type="samples.heathcare.Patient"></fact>
        </input>
        <output wrapperElementName="patientDetailRespone" namespace="http://com.test/patientDetail">
            <fact elementName="recommendDose" namespace="http://com.test/patientDetail" type="samples.heathcare.Dose"></fact>
        </output>
    </operation>
</ruleService>

Before executing this sample, it is recommended that you refer Exposing Rules as Services which explains in detail the process of writing and deploying a business rule.