snaker-core/src/main/java/org/snaker/engine/model/ProcessModel.java
public StartModel getStart() {
		for(NodeModel node : nodes) {
			if(node instanceof StartModel) {
				return (StartModel)node;
			}
		}
		return null;
	}
public StartModel getStart() {
		for(NodeModel node : nodes) {
			if(node instanceof StartModel) {
				return (StartModel)node;
			}
		}
		return null;
	}
public StartModel getStart ( ) { for ( NodeModel node : nodes ) { if ( node instanceof StartModel ) { return ( StartModel ) node ; } } return null ; }
获取process定义的start节点模型
@return
获取process定义的start节点模型