/// <summary>
/// <see href="https://github.com/AutomationML/AMLEngine2.1/wiki/Relations#externalinterface-creation-by-class-instantiation"/>
/// </summary>
/// <param name="document"></param>
internal static void CreateInterfaceClassInstance(CAEXDocument document)
{
// add a new logistic project as an Instance Hierarchy
var logisticsProject = document.CAEXFile.InstanceHierarchy.Append("LogisticsProject");
// import the standard AutomationML Interfaceclass library into the document
var interfaceClassLib = AutomationMLInterfaceClassLibType.InterfaceClassLib(document);
// add a distributing switch to your project
var dswitch = logisticsProject.New_InternalElement("distributing switch");
// the switch should contain one input and two outputs
// the standard interface class 'order' is used to model the distribution
var order = document.FindByPath(AutomationMLInterfaceClassLib.Order) as InterfaceFamilyType;
if (order == null)
{
throw new Exception("The standard interface class 'Order' doesnot exist");
}
// create three new class instances (ExternalInterface),
// the instances contain the interface class attribute 'Direction'
var input = order.CreateClassInstance("in");
var out1 = order.CreateClassInstance("out1");
var out2 = order.CreateClassInstance("out2");
// the direction value is needed, because CAEX doesnot
// provide directed instance to instance relations
input.Attribute["Direction"].Value = "In";
out1.Attribute["Direction"].Value = "Out";
out2.Attribute["Direction"].Value = "Out";
// the direction attribute is defined in the standard attribute type library
// the possible values are defined in a nominal value constraint
// you can ensure, that the assigned values are in the nominal value collection
// see the attrubte examples in the wiki for details.
dswitch.Insert(input);
dswitch.Insert(out1, asFirst: false);
dswitch.Insert(out2, asFirst: false);
}