//The version number of the EthItem Main Interface implemented by this Collection
var mainInterfaceVersion = await collection.contract.methods.mainInterfaceVersion().call();
//The version number of the EthItem Interoperable Interface model containing the code of every Item of this Collection;
var interoperableInterfaceModelVersion = (await collection.contract.methods.interoperableInterfaceModel().call())[1];
//The address of the Collection created by the Factory
var modelVersion = await collection.contract.methods.modelVersion().call();
//So every Collection cumulative version can be expressed in a way similar to this
var collectionVersion = `${category}_${mainInterfaceVersion}.${interoperableInterfaceModelVersion}.${modelVersion}`;