input: attr_vals	-- anonymous object
	| complex_object_block
	| error

---------------------- body ---------------------

attr_vals: attr_val
	| attr_vals attr_val
	| attr_vals ';' attr_val


attr_val: attr_id SYM_EQ object_block -- could be a single or multiple attr

attr_id: V_ATTRIBUTE_IDENTIFIER
	| V_ATTRIBUTE_IDENTIFIER error

--
-- An object_block is any block enclosed in <> with optional leading type name
--
object_block: complex_object_block
	| primitive_object_block

complex_object_block: single_attr_object_block
	| multiple_attr_object_block

--
-- --------------------------- multiple attr objects -------------------------------
--
multiple_attr_object_block: untyped_multiple_attr_object_block 
	| type_identifier untyped_multiple_attr_object_block

untyped_multiple_attr_object_block: multiple_attr_object_block_head keyed_objects SYM_END_DBLOCK

multiple_attr_object_block_head: SYM_START_DBLOCK

keyed_objects: keyed_object
	| keyed_objects keyed_object

keyed_object: object_key SYM_EQ object_block

object_key: '[' simple_value ']'

--
-- --------------------------- single attr objects -------------------------------
--

single_attr_object_block: untyped_single_attr_object_block
	| type_identifier untyped_single_attr_object_block

--
-- An untyped_single_attr_object_block is any block of the form:
--	<
--		attr1 = <...>
--		attr2 = <...>
--		attrN = <...>
--	>
--
untyped_single_attr_object_block: single_attr_object_complex_head SYM_END_DBLOCK
	| single_attr_object_complex_head attr_vals SYM_END_DBLOCK
	;

single_attr_object_complex_head: SYM_START_DBLOCK


--
-- ------------------------- primitive objects ---------------------
--
primitive_object_block: untyped_primitive_object_block
	| type_identifier untyped_primitive_object_block

untyped_primitive_object_block: SYM_START_DBLOCK primitive_object_value SYM_END_DBLOCK

primitive_object_value: simple_value
	| simple_list_value
	| simple_interval_value
	| term_code
	| term_code_list_value

simple_value: string_value
	| integer_value
	| real_value
	| boolean_value
	| character_value
	| date_value
	| time_value
	| date_time_value
	| duration_value
	| uri_value

simple_list_value: string_list_value
	| integer_list_value
	| real_list_value
	| boolean_list_value
	| character_list_value
	| date_list_value
	| time_list_value
	| date_time_list_value
	| duration_list_value

simple_interval_value: integer_interval_value
	| real_interval_value
	| date_interval_value
	| time_interval_value
	| date_time_interval_value
	| duration_interval_value

---------------------- BASIC DATA VALUES -----------------------

type_identifier: V_TYPE_IDENTIFIER
	| V_GENERIC_TYPE_IDENTIFIER

string_value: V_STRING

string_list_value: V_STRING ',' V_STRING
	| string_list_value ',' V_STRING
	| V_STRING ',' SYM_LIST_CONTINUE

integer_value: V_INTEGER {
	| '+' V_INTEGER {
	| '-' V_INTEGER {

integer_list_value: integer_value ',' integer_value
	| integer_list_value ',' integer_value
	| integer_value ',' SYM_LIST_CONTINUE

integer_interval_value: SYM_INTERVAL_DELIM integer_value SYM_ELLIPSIS integer_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT integer_value SYM_ELLIPSIS integer_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM integer_value SYM_ELLIPSIS SYM_LT integer_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT integer_value SYM_ELLIPSIS SYM_LT integer_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LT integer_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LE integer_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT integer_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GE integer_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM integer_value SYM_INTERVAL_DELIM

real_value: V_REAL 
	| '+' V_REAL 
	| '-' V_REAL 

real_list_value: real_value ',' real_value
	| real_list_value ',' real_value
	| real_value ',' SYM_LIST_CONTINUE

real_interval_value: SYM_INTERVAL_DELIM real_value SYM_ELLIPSIS real_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT real_value SYM_ELLIPSIS real_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM real_value SYM_ELLIPSIS SYM_LT real_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT real_value SYM_ELLIPSIS SYM_LT real_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LT real_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LE real_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT real_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GE real_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM real_value SYM_INTERVAL_DELIM

boolean_value: SYM_TRUE
	| SYM_FALSE

boolean_list_value: boolean_value ',' boolean_value
	| boolean_list_value ',' boolean_value
	| boolean_value ',' SYM_LIST_CONTINUE

character_value: V_CHARACTER

character_list_value: character_value ',' character_value
	| character_list_value ',' character_value
	| character_value ',' SYM_LIST_CONTINUE

date_value: V_ISO8601_EXTENDED_DATE -- in ISO8601 form yyyy-MM-dd

date_list_value: date_value ',' date_value
	| date_list_value ',' date_value
	| date_value ',' SYM_LIST_CONTINUE

date_interval_value: SYM_INTERVAL_DELIM date_value SYM_ELLIPSIS date_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT date_value SYM_ELLIPSIS date_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM date_value SYM_ELLIPSIS SYM_LT date_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT date_value SYM_ELLIPSIS SYM_LT date_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LT date_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LE date_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT date_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GE date_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM date_value SYM_INTERVAL_DELIM

time_value: V_ISO8601_EXTENDED_TIME

time_list_value: time_value ',' time_value
	| time_list_value ',' time_value
	| time_value ',' SYM_LIST_CONTINUE

time_interval_value: SYM_INTERVAL_DELIM time_value SYM_ELLIPSIS time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT time_value SYM_ELLIPSIS time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM time_value SYM_ELLIPSIS SYM_LT time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT time_value SYM_ELLIPSIS SYM_LT time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LT time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LE time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GE time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM time_value SYM_INTERVAL_DELIM

date_time_value: V_ISO8601_EXTENDED_DATE_TIME

date_time_list_value: date_time_value ',' date_time_value
	| date_time_list_value ',' date_time_value
	| date_time_value ',' SYM_LIST_CONTINUE

date_time_interval_value: SYM_INTERVAL_DELIM date_time_value SYM_ELLIPSIS date_time_value  SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT date_time_value SYM_ELLIPSIS date_time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM date_time_value SYM_ELLIPSIS SYM_LT date_time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT date_time_value SYM_ELLIPSIS SYM_LT date_time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LT date_time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LE date_time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT date_time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GE date_time_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM date_time_value SYM_INTERVAL_DELIM

duration_value: V_ISO8601_DURATION

duration_list_value: duration_value ',' duration_value
	| duration_list_value ',' duration_value
	| duration_value ',' SYM_LIST_CONTINUE

duration_interval_value: SYM_INTERVAL_DELIM duration_value SYM_ELLIPSIS duration_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT duration_value SYM_ELLIPSIS duration_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM duration_value SYM_ELLIPSIS SYM_LT duration_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT duration_value SYM_ELLIPSIS SYM_LT duration_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LT duration_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_LE duration_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GT duration_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM SYM_GE duration_value SYM_INTERVAL_DELIM
	| SYM_INTERVAL_DELIM duration_value SYM_INTERVAL_DELIM

term_code: V_QUALIFIED_TERM_CODE_REF
	| ERR_V_QUALIFIED_TERM_CODE_REF

term_code_list_value: term_code ',' term_code
	| term_code_list_value ',' term_code
	| term_code ',' SYM_LIST_CONTINUE

uri_value: V_URI