code: public boolean isModifiedOnVersion(String version) {
  		if (version == null || version.isEmpty()) {
  			return true;
  		}
  		if (this.history != null && this.history.isModifiedOnVersion(version)) {
  			return true;
  		}
  		if (this.fields != null) {
  			for (APIParameter param : this.fields) {
  				if (param.isModifiedOnVersion(version)) {
  					return true;
  				}
  			}
  		}
  		return false;
  	}
docs: /*
  @return Whether this parameter has modification on specified version. If
  no version specified, returns true.