# filename: ex209.rq

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX dm:  <http://learningsparql.com/ns/demo#> 
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

CONSTRUCT
{
  ?prob32item dm:problem dm:prob32 .
  dm:prob32 rdfs:label "Amount must be an integer." . 

  ?prob29item dm:problem dm:prob29 .
  dm:prob29 rdfs:label "Location value must be a URI." . 

  ?prob44item dm:problem dm:prob44 .
  dm:prob44 rdfs:label "Expenditures over 100 require grade 5 approval." . 

  dm:probXX rdfs:label "This is a dummy problem." . 
}

WHERE
{
  {
    ?prob32item dm:amount ?amount .
    FILTER ((datatype(?amount)) != xsd:integer) 
  }
  
  UNION

  {
    ?prob29item dm:location ?city .
    FILTER (!(isURI(?city)))
  }

  UNION 

  {
    ?prob44item dm:cost ?cost ;
                dm:amount ?amount .
    OPTIONAL 
    {
      ?item dm:approval ?approvingEmployee . 
      ?approvingEmployee dm:jobGrade ?grade . 
    }

    BIND (?cost * ?amount AS ?totalCost) .
    FILTER ((?totalCost > 100) &&
            ( (!(bound(?grade)) || (?grade < 5 ) )))   
  }

}