@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix xsd:  <http://www.w3.org/2001/XMLSchema#>.
@prefix dce: <http://purl.org/dc/elements/1.1/>.
@prefix log: <http://www.w3.org/2000/10/swap/log#>.
@prefix math: <http://www.w3.org/2000/10/swap/math#>.
@prefix list: <http://www.w3.org/2000/10/swap/list#>.
@prefix e: <http://eulersharp.sourceforge.net/2003/03swap/log-rules#>.
@prefix event: <http://eulersharp.sourceforge.net/2003/03swap/event#>.
@prefix physical: <http://eulersharp.sourceforge.net/2003/03swap/physicalResource#>.
@prefix time: <http://eulersharp.sourceforge.net/2003/03swap/time#>.
@prefix quant: <http://eulersharp.sourceforge.net/2003/03swap/quantities#>.
@prefix units: <http://eulersharp.sourceforge.net/2003/03swap/units#>.
@prefix human: <http://eulersharp.sourceforge.net/2003/03swap/human#>.
@prefix humanbody: <http://eulersharp.sourceforge.net/2003/03swap/humanBody#>.

<http://eulersharp.sourceforge.net/2003/03swap/bmi_rules>
    dce:title """Adult Body Mass Index rules"""@en;
    dce:creator """Hans Cools"""@en;
    dce:publisher """Agfa Healthcare/Belgium"""@en;
    dce:description """Rules to calculate an adult's body mass index (BMI) using formula: BMI = human body 'weight' (mass) (kg)/(human body length (m))²."""@en.


{   # GETTING DATA:
    ?adult human:weighs ?weightMeasurement. # a human:BiologicalAdult
    ?weightMeasurement
        quant:hasUnit units:kilogram;
        quant:hasValue ?weightValue;
        time:hasDateTime ?weightDateTime.
    [] e:optional {
        ?adult human:hasLength ?lengthMeasurement.
        ?lengthMeasurement
            quant:hasUnit units:meter;
            quant:hasValue ?lengthValue;
            time:hasDateTime ?lengthDateTime}, {
        ?adult human:hasLength ?lengthMeasurement.
        ?lengthMeasurement
            time:hasDateTime ?lengthDateTime;
            quant:convertedTo ?U.
        ?U
            quant:hasUnit units:meter;
            quant:hasValue ?lengthValue}.

    # SETTING MAXIMUM TIME DIFFERENCE BETWEEN WEIGHT AND LENGTH MEASUREMENTS:
    # Note: the smaller preset period, the smaller chance to get data
    (?weightDateTime ?lengthDateTime) math:difference ?dif.
    ?dif math:notGreaterThan "P0M"^^xsd:duration; math:notLessThan "-P0M"^^xsd:duration.    
    
    # TO ADD: e:findall -> smallest dif
    
    # CALCULATING LATEST DATE TIME OF AN EXAMINATION:
    (?weightDateTime ?lengthDateTime) e:max ?maxDateTimeNumeral.
    (?lexical xsd:dateTime) log:dtlit ?maxDateTimeNumeral, ?dateTime.
    
    # THIS DATE TIME IS USED TO CALCULATE AGE AND ALSO ASSIGNED TO FINAL RESULT
    
    # TRIGGERING BACKWARD RULE CALCULATING AGE AT MOMENT OF LATEST EXAMINATION:
    (?adult ?dateTime) time:calculatingAge ?ageInYears.
    
    # CHECK ADULT AGE:
    ?ageInYears math:notLessThan 15.
    
    # CALCULATION OF AN ADULT BODY MASS INDEX:
    ("_weightValue/_lengthValue**2" ?weightValue ?lengthValue) e:calculate ?bodyMassIndexValue}
=>
{   ?adult
        human:hasBodyMassIndex ?V.
    ?V
        quant:hasUnit units:kilogramPerMeterSquare;
        quant:hasValue ?bodyMassIndexValue;
        time:hasDateTime ?dateTime;
        event:basedOn ?weightMeasurement, ?lengthMeasurement}.


# CALCULATION OF AN ADULT BODY MASS INDEX STARTING FROM BODY LENGTH AND WEIGHT MEASUREMENTS HAVING A DATE WITHOUT TIME:
# Note: Body weight and length measurements are each placed in a period with margin of 1 day with epsilon subtracted from the end date time.
# This is because the time of the measurement is unknown.

{   # GETTING DATA
    ?adult human:weighs ?weightMeasurement. # a human:BiologicalAdult
    ?weightMeasurement
        quant:hasUnit units:kilogram;
        quant:hasValue ?weightValue;
        time:hasObtainingPeriodMargin (?weightPeriodBeginning ?weightPeriodEnd).
    [] e:optional {
        ?adult human:hasLength ?lengthMeasurement.
        ?lengthMeasurement
            quant:hasUnit units:meter;
            quant:hasValue ?lengthValue;
            time:hasObtainingPeriodMargin (?lengthPeriodBeginning ?lengthPeriodEnd)}, {
        ?adult human:hasLength ?lengthMeasurement.
        ?lengthMeasurement
            time:hasObtainingPeriodMargin (?lengthPeriodBeginning ?lengthPeriodEnd);
            quant:convertedTo ?U.
        ?U
            quant:hasUnit units:meter;
            quant:hasValue ?lengthValue}.

    # SETTING MAXIMUM TIME DIFFERENCE BETWEEN WEIGHT AND LENGTH MEASUREMENTS:
    # Note: the smaller set time difference, the smaller chance to get data
    (?weightPeriodBeginning ?lengthPeriodEnd) math:difference ?dif1.
    ?dif1 math:notGreaterThan "P0M"^^xsd:duration.
    (?lengthPeriodBeginning ?weightPeriodEnd) math:difference ?dif2.
    ?dif2 math:notGreaterThan "P0M"^^xsd:duration.
    
    # CALCULATING LATEST DATE TIME OF AN EXAMINATION:
    (?weightPeriodEnd ?lengthPeriodEnd) e:max ?maxDateTimeNumeral.
    (?lexical xsd:dateTime) log:dtlit ?maxDateTimeNumeral, ?dateTime.
    
    # THIS DATE TIME IS USED TO CALCULATE AGE AND ALSO ASSIGNED TO FINAL RESULT
    
    # TRIGGERING BACKWARD RULE CALCULATING AGE AT MOMENT OF LATEST EXAMINATION:
    (?adult ?dateTime) time:calculatingAge ?ageInYears.
    
    # CHECK ADULT AGE:
    ?ageInYears math:notLessThan 15.
    
    # CALCULATION OF AN ADULT BODY MASS INDEX:
    ("_weightValue/_lengthValue**2" ?weightValue ?lengthValue) e:calculate ?bodyMassIndexValue}
=>
{   ?adult
        human:hasBodyMassIndex ?V.
    ?V
        quant:hasUnit units:kilogramPerMeterSquare;
        quant:hasValue ?bodyMassIndexValue;
        time:hasDateTime ?dateTime;
        event:basedOn ?weightMeasurement, ?lengthMeasurement}.


# CALCULATION OF AN ADULT BODY MASS INDEX INCLUDING DECLARATION OF A BODY:

{   ?adult physical:hasComplexity ?body. # human:BiologicalAdult
    ?body
        a humanbody:Body;
        humanbody:hasLength ?length;
        humanbody:hasWeight ?weight.
    ?length
        a humanbody:Length;
        quant:hasMeasurement ?lengthMeasurement.
    ?lengthMeasurement
        quant:hasUnit units:meter;
        quant:hasValue ?lengthValue;
        time:hasDateTime ?lengthDateTime.
    ?weight
        a humanbody:Weight;
        quant:hasMeasurement ?weightMeasurement.
    ?weightMeasurement
        quant:hasUnit units:kilogram;
        quant:hasValue ?weightValue;
        time:hasDateTime ?weightDateTime.
    (?weightDateTime ?lengthDateTime) math:difference ?dif.
    ?dif math:notGreaterThan "P10Y"^^xsd:duration; math:notLessThan "-P7D"^^xsd:duration.
    (?weightDateTime ?lengthDateTime) e:max ?maxDateTimeNumeral.
    (?lexical xsd:dateTime) log:dtlit ?maxDateTimeNumeral, ?dateTime.
    (?adult ?dateTime) time:calculatingAge ?ageInYears.
    ?ageInYears math:notLessThan 15.
    (?lengthValue 2) math:exponentiation ?lengthValue2.
    (?weightValue ?lengthValue2) math:quotient ?bodyMassIndexValue}
=>
{   ?adult
        human:hasBodyMassIndex ?V.
    ?V
        quant:hasUnit units:kilogramPerMeterSquare;
        quant:hasValue ?bodyMassIndexValue;
        time:hasDateTime ?dateTime;
        event:basedOn ?weightMeasurement, ?lengthMeasurement}.
