question: gets the optional params . concode_field_sep List<LinkParameter> requiredParams concode_elem_sep String rel concode_elem_sep List<LinkParameter> optionalParams concode_elem_sep String href concode_elem_sep HttpMethod httpMethod concode_elem_sep Pattern PATH_VAR_PATTERN concode_field_sep String getHref concode_elem_sep String getHref concode_elem_sep String getHref concode_elem_sep String addParameters concode_elem_sep String addParameters concode_elem_sep void validateRequiredParameter concode_elem_sep String substituteVariables concode_elem_sep void validateRequestParameters concode_elem_sep String getRel concode_elem_sep boolean isEmptyString concode_elem_sep String ensureAbsoluteUrl concode_elem_sep boolean hasParameter concode_elem_sep List<LinkParameter> getRequiredParams concode_elem_sep void validateOptionalParameters concode_elem_sep Map<String,Parameter> toMap concode_elem_sep HttpMethod getHttpMethod concode_elem_sep String toString concode_elem_sep Parameter getParameter concode_elem_sep LinkParameter getParameter concode_elem_sep String substituteUrlPathParameters
target: List < LinkParameter > function ( ) { return optionalParams ; }