public Contribution createContribution(String contributorId, boolean isDynamic) { return new Contribution(contributorId, registry, isDynamic);
public Contribution createContribution(String contributorId, boolean persist) { return new Contribution(contributorId, registry, persist);
	public Contribution createContribution(String contributorId, boolean isDynamic) {		return new Contribution(contributorId, registry, isDynamic);	}