code: public String getPropertyUriPattern(PropertyIdValue propertyIdValue) {
  		if (!this.datatypes.containsKey(propertyIdValue.getId())) {
  			fetchPropertyInformation(propertyIdValue);
  		}
  		return this.uriPatterns.get(propertyIdValue.getId());
  
  	}
docs: Returns the URI Pattern of a {@link PropertyIdValue} that should be used
  to create URIs of external resources from statement values for the
  property.
  
  @param propertyIdValue
  property to fetch URI pattern for
  @return string pattern using "$1" as a placeholder, or null if no pattern
  was found for the given property