/**
  * Constructor
  * Initialize the files
  */
 public function __construct()
 {
     parent::__construct();
     if (!file_exists($this->xslFile)) {
         throw new Exception("Unable to found the xsl file {$this->xslFile}");
     }
     file_put_contents($this->outputFile, '');
 }
 /**
  * Constructor: init api connection and the ref API resources
  */
 public function __construct()
 {
     parent::__construct();
     //initialize ref to API classes and properties
     $this->rdfLiteralClass = new core_kernel_classes_Class(RDFS_LITERAL);
     $this->processInstanceClass = new core_kernel_classes_Class(CLASS_PROCESSINSTANCES);
     $this->serviceDefClass = new core_kernel_classes_Class(CLASS_SUPPORTSERVICES);
     $this->serviceUrlProp = new core_kernel_classes_Property(PROPERTY_SUPPORTSERVICES_URL);
     $this->serviceFormalParamInProp = new core_kernel_classes_Property(PROPERTY_SERVICESDEFINITION_FORMALPARAMIN);
     $this->processVarClass = new core_kernel_classes_Class(CLASS_PROCESSVARIABLES);
     $this->processVarCodeProp = new core_kernel_classes_Property(PROPERTY_PROCESSVARIABLES_CODE);
     $this->formalParamClass = new core_kernel_classes_Class(CLASS_FORMALPARAMETER);
     $this->formalParamNameProp = new core_kernel_classes_Property(PROPERTY_FORMALPARAMETER_NAME);
     $this->formalParamDefProcessVarProp = new core_kernel_classes_Property(PROPERTY_FORMALPARAMETER_DEFAULTPROCESSVARIABLE);
     $this->formalParamDefConstantProp = new core_kernel_classes_Property(PROPERTY_FORMALPARAMETER_DEFAULTCONSTANTVALUE);
 }