| abstract
| - year ::= full-year | simple-year ; ±E*CCYY | CCYY | YY full-year ::= short-year | long-year ; ±E*CCYY | CCYY basic-year ::= short-year | simple-year ; CCYY | YY simple-year ::= to-doublezero ; YY = 00..99 short-year ::= simple-century simple-year ; CCYY = 0000..9999 long-year ::= positive-year | negative-year ; ±E*CCYY positive-year ::= plus long-century simple-year ; +E*CCYY negative-year ::= minus long-century simple-year ; -E*CCYY century ::= simple-century | long-century ; E*CC simple-century ::= to-doublezero ; CC = 00..99 long-century ::= (1-6)*DIGIT simple-century ; C+ = ... triad-of-year ::= to-four ; Q = 1..4 month-of-year ::= to-twelve ; MM = 01..12 month-of-triad ::= to-three ; M = 1..3 month-of-quart ::= to-three ; M = 1..3 day-of-year ::= to-threesixtysix ; DDD = 001..365/366 not 364/371 day-of-triad ::= to-ninetytwo ; DD = 01..90/91/92 day-of-month ::= to-thirtyone ; DD = 01..28/29/30/31 day-of-week ::= to-seven ; D = 1..7 not 0 day-of-quart ::= to-ninetyeight ; DD = 01..91/98 day-of-moon ::= to-thirtyfive ; DD = 01..28/35 day-of-lunation ::= to-thirty ; DD = 01..29/30 weekday ::= to-seven ; D = 0..7 ; null-days not handled yet weekday-of-triad ::= to-fourteen ; WW = 00/01..12/13/14 weekday-of-month ::= to-five ; W = 0/1..4/5 weekday-of-lunation ::= to-five ; W = 0/1..4/5 week-of-year ::= to-fiftythree ; WW = 01..52/53 week-of-triad ::= to-fourteen ; WW = 01..12/13/14 week-of-quart ::= to-fourteen ; WW = 01..13/14 week-of-month ::= to-five ; W = 1..4/5 week-of-moon ::= to-five ; W = 1..4/5 quart-of-year ::= to-four ; Q = 1..4 moon-of-year ::= to-thirteen ; MM = 01..13 lunation-of-year ::= to-thirteen ; MM = 01..13 part-of-date ::= part-of ; season-of-year ::= to-four ; Q = 1..4 sign-of-season ::= to-three ; M = 1..3 quarter-of-f-year ::= to-four ; 'F'Q = 0/1..4 month-of-f-year ::= to-twelve ; 'F'MM = 00/01..12 day-of-f-year ::= to-threesixty ; 'F'DDD = 001..360 day-of-f-month ::= to-thirty ; 'F'DD = 00/01..30 TIMES hour ::= to-twentyfour ; hh = 00..23/24 minute ::= to-fiftynine ; mm = 00..59 second ::= to-sixty ; ss = 00..58/59/60 part-of-time ::= part-of ; GENERAL part-of ::= decimal-separator digit [digit]* ; ('.'|',')f+ digit ::= zero | to-nine single-digit ::= digit double-digit ::= single-digit single-digit triple-digit ::= double-digit single-digit zero-thru-two ::= zero one-thru-two zero-thru-three ::= zero one-thru-three zero-thru-four ::= zero one-thru-four zero-thru-five ::= zero one-thru-five zero-thru-seven ::= zero one-thru-seven zero-thru-nine ::= zero one-thru-nine zero-thru-ninetynine::= zero one-thru-ninetynine one-thru-two ::= one | two one-thru-three ::= one-thru-two | three one-thru-four ::= one-thru-three | four one-thru-five ::= one-thru-four | five one-thru-seven ::= one-thru-five | six | seven one-thru-nine ::= one-thru-seven | eight | nine one-thru-ninetynine ::= [zero one-thru-nine] | [one-thru-nine zero-thru-nine] fields "to-*": single-digit to-two ::= one | two | field-wildcard to-three ::= to-two | three to-four ::= to-three | four to-five ::= to-four | five to-seven ::= to-five | six | seven to-nine ::= to-seven | eight | nine double-digit to-nine-pad ::= zero one-thru-nine | field-wildcard to-twelve ::= to-nine-pad | [one zero-thru-two] to-thirteen ::= to-twelve | [one three] to-fourteen ::= to-thirteen | [one four] to-twentyfour ::= to-nine-pad | [one zero-thru-nine] | [two [zero-thru-four]] to-twentyeight ::= to-twentyfour | [two [five | six | seven | eight]] to-twentynine ::= to-twentyeight | [two nine] to-thirty ::= to-twentynine | [three zero] to-thirtyone ::= to-thirty | [three one] to-thirtyfive ::= to-thirtyone | [three [two | three | four | five]] to-fiftytwo ::= to-nine-pad | [one-thru-four zero-thru-nine] | [five zero-thru-two] to-fiftythree ::= to-fiftytwo | [five three] to-fiftyeight ::= to-fiftythree | [five [four | five | six | seven | eight]] to-fiftynine ::= to-fiftyeight | [five nine] to-sixty ::= to-fifty-nine | [six zero] to-ninety ::= to-fifty-nine | seven | eight] digit] | [nine zero] to-ninetyone ::= to-ninety | [nine one] to-ninetytwo ::= to-ninetyone | [nine two] to-ninetyeight ::= to-ninetytwo | [nine [three | four | five | six | seven | eight to-ninetynine ::= to-ninetyeight | [nine nine] to-doublezero ::= to-ninetynine | [zero zero] triple-digit to-ninetynine-pad ::= zero one-thru-ninetynine | field-wildcard to-threesixty ::= to-ninetynine-pad | [one-thru-two zero-thru-ninetynine] | [three [[zero-thru-five zero-thru-nine] | [six zero]]] to-threesixtyfour ::= to-threesixty | [three six [one | two | three | four]] to-threesixtyfive ::= to-threesixtyfour | [three six five] to-threesixtysix ::= to-threesixtyfive | [three six six] to-threeseventyone ::= to-threesixty | [three [[six one-to-nine] | [seven [zero | one]]]] Separators separator ::= datetime-separator | decimal-separator | span-separator datetime-separator ::= time-separator | space null-separator ::= empty | comment date-separator ::= [comment]* dash [comment]* time-separator ::= [comment]* colon [comment]* decimal-separator ::= [comment]* [comma | dot] [comment]* span-separator ::= [comment]* slash [comment]* interval-separator ::= span-separator | hyphen uncertain-separator ::= tilde | plusminus Wildcards wildcard ::= digit-wildcard | field-wildcard digit-wildcard ::= provide-wildcard | unknown-wildcard provide-wildcard ::= underscore unknown-wildcard ::= X field-wildcard ::= asterisk template-wildcard ::= hash Alternate path syntax optional, restricted only if compact forms and durations and time zones are not used processed after percent-decoding date-key ::= date-marker ; uppercase keys only? time-key ::= time-marker duration-key ::= duration-marker repetition-key ::= repetition-marker pair ::= any-par | dating-pair any-pair ::= key pair-separator value key ::= ; defined elsewhere value ::= date | time | datetime | duration | repetition dating-pair ::= datetime-pair | [date-pair || time-pair] | duration-pair | repetition-pair datetime-pair ::= date-key pair-separator datetime date-pair ::= date-key pair-separator date time-pair ::= time-key pair-separator time duration-pair ::= duration-key pair-separator duration repetition-pair ::= repetition-key pair-separator repetition query ::= query-marker [pair | value] normal key-value combinations should still be possible, but this is not specified here not implemented: time intervals specified by slash-separated start date as path and end date or duration with slashes as query without name value distinction, e.g. /2012/09/01?/10/08 = 2012-09-01/10-08 path-separator ::= path-date-separator ::= slash path-time-separator ::= slash path-span-separator ::= question path-query-marker ::= hash | question path-query-separator::= semicolon | ampersand path-pair-separator ::= equals path-date-marker ::= slash | date-marker path-time-marker ::= slash | time-marker Markers prefix suffix marker ::= day-marker | month-marker | week-marker | moon-marker | quarter-marker | lunar-marker | season-marker | fiscal-marker | date-marker | time-marker | duration-marker | repetition-marker quarter-marker ::= triad-marker | quart-marker triad-marker ::= empty quart-marker ::= Q season-marker ::= S month-marker ::= empty moon-marker ::= M lunar-marker ::= L week-marker ::= W day-marker ::= empty fiscal-marker ::= F date-marker ::= D time-marker ::= T duration-marker ::= P repetition-marker ::= R UTC-marker ::= Z definition-marker ::= at leap-item-marker ::= asterisk intercalary-marker ::= plus Pairs comment-start ::= open-angle comment-end ::= close-angle date-start ::= open-paren date-end ::= close-paren duration-start ::= open-bracket duration-end ::= close-bracket repetition-start ::= open-brace repetition-end ::= close-brace Unit symbols unit year-unit ::= Y quarter-unit ::= Q triad-unit ::= quarter-unit ; 3M quart-unit ::= quarter-unit ; 13W season-unit ::= quarter-unit ; 3M month-unit ::= M moon-unit ::= month-unit ; 4W or 28D fiscal-unit ::= month-unit | F ; 30D lunation-unit ::= month-unit | L ; 29/30D week-unit ::= W ; 7D day-unit ::= D hour-unit ::= H minute-unit ::= M second-unit ::= S FORMATS -std suffix for human-readable standard (or extended) format with hyphens or colons -basic suffix for compact formats without hyphens or colons Existing formats century ::= century ; see above year ::= year ; see above year-day ::= year-day-std | year-day-basic year-day-std ::= [year]? date-separator day-of-year year-day-basic ::= [year]? null-separator day-of-year year-month ::= year-month-std | year-month-basic year-month-std ::= [year]? date-separator month-of-year year-month-basic ::= null-separator year-month-implied ::= null-separator year-month-day ::= year-month-day-std | basic-day-month-year year-month-day-std ::= [year-month-std | year-month-implied] date-separator day-of-month year-month-day-basic ::= year-basic null-separator month-of-year null-separator day-of-month year-week ::= year-week-std | year-week-basic std-week-year ::= [year]? date-separator week-marker week-of-year basic-week-year ::= [year]? null-separator week-marker week-of-year ; allows YY'W'WW implied-year-week ::= date-separator ; 'W'? year-week-day ::= year-week-day-std | year-week-day-basic year-week-day-std ::= [year-week-std | implied-year-week] date-separator day-of-week year-week-day-basic ::= [year-week-basic]? null-separator day-of-week ; allows YY'W'WWD and D New month-based formats year-triad ::= [full-year]? date-separator triad-of-year year-triad-month ::= year-triad date-separator month-of-triad ; forbids --M year-triad-month-day ::= [year-triad-month | date-separator date-separator month-of-triad] date-separator day-of-month ; allows --M-DD year-triad-weekday ::= year-triad date-separator weekday-of-triad date-separator weekday year-month-weekday ::= [year-month-std | date-separator] weekday-of-month date-separator weekday year-triad-month-weekday; possible, but not specified New week-based formats weekyear ::= full-year [week-marker | quart-marker | moon-marker] Quarts year-quart ::= year-quart-std | basic-quart-year year-quart-std ::= [full-year]? date-separator quart-marker quart-of-year year-quart-basic ::= [full-year]? null-separator quart-marker quart-of-year year-quart-implied ::= date-separator quart-marker year-quart-day ::= year-quart-day-std | year-quart-day-basic year-quart-day-std ::= [year-quart-std | year-quart-implied] date-separator day-of-quart ; allows '-Q-'DD year-quart-day-basic ::= year-quart-basic null-separator day-of-quart year-quart-week ::= year-quart-week-std | year-quart-week-basic year-quart-week-std ::= [year-quart-std | year-quart-implied] date-separator week-marker week-of-quart year-quart-week-basic ::= [year-quart-basic | quart-marker] null-separator week-marker week-of-quart year-quart-week-day ::= year-quart-week-day-std | year-quart-week-day-basic year-quart-week-day-std ::= year-quart-week-std date-separator day-of-week year-quart-week-day-basic ::= year-quart-week-basic null-separator day-of-week Dual months year-quart-month ::= year-quart-month-std | year-quart-month-basic year-quart-month-std ::= year-quart-std date-separator month-of-quart year-quart-month-basic::= year-quart-basic null-separator month-of-quart year-quart-month-day ::= year-quart-month-day-std | year-quart-month-day-basic year-quart-month-day-std ::= year-quart-month-std date-separator day-of-month ; 01..30/31 year-quart-month-day-basic::= year-quart-month-basic null-separator day-of-month; 01..30/31 year-quart-month-week ::= year-quart-month-week-std | year-quart-month-week-basic year-quart-month-week-std ::= year-quart-month-std date-separator week-of-month ; 4..5 year-quart-month-week-basic::= year-quart-month-basic null-separator week-of-month ; 4..5 year-quart-month-week-day ::= year-quart-month-week-day-std | year-quart-month-week-day-basic year-quart-month-week-day-std ::= year-quart-month-week-std date-separator day-of-week year-quart-month-week-day-basic ::= year-quart-month-week-basic null-separator day-of-week Moons year-moon ::= year-moon-std | year-moon-basic year-moon-std ::= [full-year]? date-separator moon-marker moon-of-year year-moon-basic ::= [full-year]? null-separator moon-marker moon-of-year year-moon-implied ::= date-separator moon-marker year-moon-day ::= year-moon-day-std | year-moon-day-basic year-moon-day-std ::= [year-moon-std | year-moon-implied]? date-separator day-of-moon year-moon-day-basic ::= [year-moon-basic]? null-separator day-of-moon year-moon-week ::= year-moon-week-std | year-moon-week-basic year-moon-week-std ::= [year-moon-std | year-moon-implied]? date-separator week-marker week-of-moon year-moon-week-basic ::= [year-moon-basic | moon-marker]? null-separator week-marker week-of-moon year-moon-week-day ::= year-moon-week-day-std | year-moon-week-day-basic year-moon-week-day-std ::= year-moon-week-std date-separator day-of-week year-moon-week-day-basic ::= year-moon-week-basic null-separator day-of-week New month-week-based formats year-triad-week ::= year-triad date-separator week-marker week-of-triad year-triad-week-day ::= year-triad-week date-separator day-of-week year-month-week ::= [year-month | year-month-implied] date-separator week-marker week-of-month year-month-week-day ::= year-month-week date-separator day-of-week New financial formats optional fiscalyear ::= full-year fiscal-marker should the marker be part of the quarter, month and day fields instead of the year field? year-fiscal-std ::= [full-year]? date-separator fiscal-marker year-fiscal-basic ::= [full-year]? null-separator fiscal-marker year-quarter-fiscal ::= year-quarter-fiscal-std | year-quarter-fiscal-basic year-quarter-fiscal-std ::= year-fiscal-std date-separator quarter-of-f-year year-quarter-fiscal-basic ::= year-fiscal-basic null-separator quarter-of-f-year year-month-fiscal ::= year-month-fiscal-std | year-month-fiscal-basic year-month-fiscal-std ::= year-fiscal-std date-separator month-of-f-year year-month-fiscal-basic ::= year-fiscal-basic null-separator month-of-f-year year-day-fiscal ::= year-day-fiscal-std | year-day-fiscal-basic ; deprecate? year-day-fiscal-std ::= year-fiscal-std date-separator day-of-f-year ; deprecate? year-day-fiscal-basic ::= year-fiscal-basic null-separator day-of-f-year ; deprecate? year-month-fiscal-day ::= year-month-fiscal-day-std | year-month-fiscal-day-basic year-month-fiscal-day-std ::= year-month-fiscal-std date-separator day-of-f-month year-month-fiscal-day-basic::= year-month-fiscal-basic null-separator day-of-f-month New astronomic and astrologic formats optional Lunar lunaryear ::= full-year lunar-marker should the marker be part of the lunation field instead of the year field? year-lunar-std ::= [full-year]? date-separator lunar-marker year-lunar-basic ::= [full-year]? null-separator lunar-marker year-lunation ::= year-lunation-std | year-lunation-basic year-lunation-std ::= year-lunar-std lunation-of-year year-lunation-basic ::= year-lunar-basic lunation-of-year year-lunation-day ::= year-lunation-day-std | year-lunation-day-basic year-lunation-day-std ::= year-lunation-std date-separator day-of-lunation year-lunation-day-basic ::= year-lunation-basic null-separator day-of-lunation year-lunation-weekday ::= year-lunation-std date-separator weekday-of-lunation date-separator weekday compact format of year-lunation-weekday is invalid Season and zodiac sign seasonyear ::= full-year season-marker ; astroyear should the marker be part of the season field instead of the year field? year-season ::= year-season-std | year-season-basic year-season-std ::= [full-year]? date-separator season-marker season-of-year year-season-basic ::= [full-year]? null-separator season-marker season-of-year year-season-implied ::= date-separator season-marker year-season-sign ::= year-season-sign-std | year-season-sign-basic year-season-sign-std ::= [year-season-std | year-season-implied] date-separator sign-of-season year-season-sign-basic ::= year-season-basic null-separator sign-of-season Date in general datetime ::= [date [datetime-separator time]] | [[date-marker]? fraction-date] date ::= [date-marker]? integer-date integer-date ::= year-number | quarter | month | week | day fraction-date ::= date part-of-date ; includes part of day, i.e. time without 'T' date fields ordered by precision, no matter whether some part may be implied year-number ::= year | weekyear | fiscalyear | lunaryear | seasonyear ; year = monthyear quarter ::= triad | quart | fiscal-quarter | season triad ::= triad-year ; triad-in-year quart ::= quart-year ; quart-in-year fiscal-quarter ::= fiscal-quarter-year season ::= season-year ; season-in-year month ::= common-month | dual-month | moon | fiscal-month | lunation | sign common-month ::= month-in-year | month-in-triad month-in-year ::= month-year month-in-triad ::= month-triad-year sign ::= sign-season-year ; sign-in-season, sign-in-year is not defined dual-month ::= month-quart-year ; month-in-quart moon ::= moon-year ; moon-in-year fiscal-month ::= fiscal-month-year ; lunation ::= lunation-year ; lunation-in-year week ::= week-in-year | week-in-quarter | week-in-month week-in-year ::= week-year week-in-quarter ::= week-quart-year | week-triad-year week-in-month ::= week-month-quart-year | week-month-year | week-moon-year day ::= day-in-year | day-in-quarter | day-in-month | day-in-week | weekday day-in-year ::= day-year | fiscal-day-year day-in-quarter ::= day-quart-year day-in-month ::= day-month-quart-year | day-month-triad-year | day-month-year | day-moon-year | day-lunation-year | fiscal-day-month-year day-in-week ::= day-week-year | day-week-quart-year | day-week-triad-year | day-week-month-quart-year | day-week-month-year | day-week-moon-year weekday ::= weekday-in-quarter | weekday-in-month weekday-in-quarter ::= weekday-triad-year weekday-in-month ::= weekday-lunation-year | weekday-month-year Time time ::= hour-time | minute-time | second-time ; time-marker is not mandatory fraction-time ::= [hour | hour-minute | hour-minute-second] part-of-time hour-time ::= hour [part-of-time]? minute-time ::= hour-minute [part-of-time]? second-time ::= hour-minute-second [part-of-time]? hour-implied ::= time-separator hour-minute ::= hour-minute-std | hour-minute-basic std-hour-minute ::= hour time-separator minute basic-hour-minute ::= hour null-separator minute hour-minute-implied ::= implied-hour time-separator hour-minute-second ::= hour-minute-second-std | hour-minute-second-basic hour-minute-second-std ::= hour-minute-std time-separator second hour-minute-second-basic ::= hour-minute-basic null-separator second timezone ::= UTC-marker | offset offset ::= [plus | minus] [hour | hour-minute] TO DO Allow decimal time of day without ‘T’ prefix: “.5” and “,5” mean 12:00:00. Allow decimal part with comma after century, year, week year, quart, triad, month, moon, week and, of course, day. Furthermore, allow spreadsheet-compatible date-times with day-count from 1900-01-01 epoch and dot divider: Intervals, spans, periods, repetitions ‘Q’ is added for the 13|14-week quart, 3-month triads remain “3M” ‘F’ is added for the 30-day month (“30D”). ‘L’ is added for the lunar month (ca. 29.5 days). It should only be used with absolute start or end date. repetition ::= repetition-marker [number]? span-separator interval interval ::= datetime span-separator datetime | datetime span-separator duration | duration span-separator datetime | duration = datetime span-separator [ datetime | duration ] | duration [ span-separator datetime ]? duration ::= duration-marker [ datetime | datetime-duration ] datetime-duration ::= date-duration [time-marker time-duration]? date-duration ::= [number year-unit]? [number [month-unit | week-unit]]? [number day-unit]? time-duration ::= [number hour-unit]? [number minute-unit]? [number second-unit]? number ::= [1-9] *DIGIT [part-of]? ; are fractional parts allowed or just for one field? Alternate syntax optional alt-datetime ::= datetime | pair-datetime ; [date-start datetime date-end] pair-datetime ::= date-start [integer-date [date-end date-start time]? | fraction-date] date-end] alt-duration ::= duration | pair-duration pair-duration ::= duration-start [ alt-datetime | datetime-duration ] duration-end alt-interval ::= interval | pair-interval pair-interval ::= interval-start alt-datetime interval-separator [ alt-datetime | alt-duration ] | alt-duration [ interval-separator alt-datetime ]? interval-end alt-repetition ::= repetition | pair-repetition pair-repetition::= [number]? repetition-start alt-interval repetition-end these do not yet handle the case where the markers are used in combination with parentheses or brackets other rules not fully implemented yet: When intervals are specified with start and end date and no duration, fields may be left out from the end date and are assumed to be the same as for the start date, e.g. 2012-09-10/11 is a two-day span. When start and end datetime in intervals are enclosed by '(' and ')', the separating slash may be replaced by a double hyphen ‘--’ or en dash ‘–’. The opening bracket is placed before the P marker if both are used. When the bracket notation is used, alternate symbols may be used for the year ‘a’, the month ‘mon’ and the minute ‘min’ and whitespace is permissable after symbols. The opening brace is placed after the R marker, the optional number of repetitions and then optional slash partial duration, uncertainty optional field-start ::= open-bracket field-end ::= close-bracket field ::= field-start field-list field-end field-list ::= field-value [semicolon field-value]* field-value ::= field-span | field-uncertain | field-item field-span ::= field-item interval-separator field-item field-uncertain ::= field-item uncertain-separator field-item ; amount of uncertainty must be padded to the same length as usual field values, but may be zero, which is not yet handled, there is no way yet to specify deviation in one direction only (i.e. before/minus and after/plus) field-item ::= ;... Template optional template-start ::= comment-start template-end ::= comment-end template-separator ::= slash pattern-separator ::= colon template-field ::= template-start template-ordinal [template-separator template-pattern]* template-end template-ordinal ::= field-value | template-wildcard ; but no nested comment template-pattern ::= template-length [pattern-separator template-length]* template-length ::= [field-item || [leap-item-marker [number]?] || [intercalary-marker [number]?]] TERMINAL SYMBOLS zero ::= '0' | digit-wildcard one ::= '1' | digit-wildcard two ::= '2' | digit-wildcard three ::= '3' | digit-wildcard four ::= '4' | digit-wildcard five ::= '5' | digit-wildcard six ::= '6' | digit-wildcard seven ::= '7' | digit-wildcard eight ::= '8' | digit-wildcard nine ::= '9' | digit-wildcard plus ::= '+' minus ::= '-' | '–' | '−' ; hyphen-minus, en-dash, minus sign hyphen ::= '--' | '–' | '‐' | '‑' | ''; double hyphen, en-dash, hyphens dash ::= '-' | '–' ; hyphen-minus, en-dash plusminus ::= '±'; slash ::= '/' ; solidus comma ::= ',' dot ::= '.' ; period, full stop colon ::= ':' semicolon ::= ';' tilde ::= '~' underscore ::= '_' ; low line asterisk ::= '*' ; star at ::= '@' hash ::= '#' question ::= '?' ampersand ::= '&' equals ::= '=' empty ::= space ::= ' ' | |
| | \f ; several types of whitespace Pairs open-angle ::= '<' | '‹' ; angular bracket, guillemet close-angle ::= '>' | '›' open-paren ::= '(' ; round bracket, parentheses close-paren ::= ')' open-bracket ::= '[' ; square bracket close-bracket ::= ']' open-brace ::= '{' ; curly bracket close-brace ::= '}' Letters, ASCII-case insensitive A ::= 'A' | 'a' B ::= 'B' | 'b' C ::= 'C' | 'c' D ::= 'D' | 'd' E ::= 'E' | 'e' F ::= 'F' | 'f' G ::= 'G' | 'g' H ::= 'H' | 'h' I ::= 'I' | 'i' ; should not be used, because of confusion with one ‘1’ J ::= 'J' | 'j' K ::= 'K' | 'k' L ::= 'L' | 'l' M ::= 'M' | 'm' N ::= 'N' | 'n' O ::= 'O' | 'o' ; should not be used, because of confusion with zero ‘0’ P ::= 'P' | 'p' Q ::= 'Q' | 'q' R ::= 'R' | 'r' S ::= 'S' | 's' T ::= 'T' | 't' U ::= 'U' | 'u' V ::= 'V' | 'v' W ::= 'W' | 'w' X ::= 'X' | 'x' Y ::= 'Y' | 'y' Z ::= 'Z' | 'z'
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![[RDF Data]](/fct/images/sw-rdf-blue.png)