Authority 045 szerkesztése (szakasz)

== GUIDELINES FOR APPLYING CONTENT DESIGNATORS ==

:'''INDICATORS'''

:'''First Indicator - Type of time period in subfield $b or $c'''
::Whether a subfield $b or $c is present in the field; and, when subfield $b or $c is present, the type of time period it contains. The values distinguish among a single date/time, multiple single dates/times, and a range of dates/times.

:::'#' - '''Subfield $b or $c not present'''

:::'''0 - Single date/time'''
::::Subfield $b and/or $c is present and contains a single date/time.
									
:::::150 	##$aLunar petrology
:::::'''045''' 	0#$c2500000000

:::'''1 - Multiple single dates/times'''
::::Multiple $b and/or $c subfields are present, each containing a date/time. A range of dates/times is identified by value 2.
									
:::::'''045''' 	1#$bd1972$bd1975
::::::''[1972 and 1975]''

:::'''2 - Range of dates/times'''
::::Two $b and/or $c subfields are present and together express a range of dates and/or times. Multiple single dates and/or times are identified by value 1.
									
:::::150 	##$aShenandoah Valley Campaign, 1864 (May-August)
:::::'''045''' 	2#$bd186405$bd186408
									
:::::150 	##$aAurignacian culture
:::::'''045''' 	2#$c25000$c15000

:'''Second Indicator - Undefined'''
::Contains a blank (#).

:'''SUBFIELD CODES'''

::'''$a - Time period code'''
:::Four-character alphanumeric code derived from the "Time Period Code Table" for B.C. and C.E. time periods.
:::Each time period code associated with a heading is contained in a separate subfield $a.

::'''Time Period Code Table'''

::''B.C. (Before Common Era)''

:::{|
!Code
!Time period
|-
|'''a0'''
|before 2999
|-
|'''b0'''
|2999-2900
|-
|'''b1'''
|2899-2800
|-
|'''b2'''
|2799-2700
|-
|'''b3'''
|2699-2600
|-
|'''b4'''
|2599-2500
|-
|'''b5'''
|2499-2400
|-
|'''b6'''
|2399-2300
|-
|'''b7'''
|2299-2200
|-
|'''b8'''
|2199-2100
|-
|'''b9'''
|2099-2000
|-
|'''c0'''
|1999-1900
|-
|'''c1'''
|1899-1800
|-
|'''c2'''
|1799-1700
|-
|'''c3'''
|1699-1600
|-
|'''c4'''
|1599-1500
|-
|'''c5'''
|1499-1400
|-
|'''c6'''
|1399-1300
|-
|'''c7'''
|1299-1200
|-
|'''c8'''
|1199-1100
|-
|'''c9'''
|1099-1000
|-
|'''d0'''
|999-900
|-
|'''d1'''
|899-800
|-
|'''d2'''
|799-700
|-
|'''d3'''
|699-600
|-
|'''d4'''
|599-500
|-
|'''d5'''
|499-400
|-
|'''d6'''
|399-300
|-
|'''d7'''
|299-200
|-
|'''d8'''
|199-100
|-
|'''d9'''
|99-1
|}


::''C.E. (Common Era)''
::(Add 0, 1, 2, ... 9 to each alphabetic character for the decade)

:::{|
!Code
!Time period
|-
|'''e'''
|1-99
|-
|'''f'''
|100-199
|-
|'''g'''
|200-299
|-
|'''h'''
|300-399
|-
|'''i'''
|400-499
|-
|'''j'''
|500-599
|-
|'''k'''
|600-699
|-
|'''l'''
|700-799
|-
|'''m'''
|800-899
|-
|'''n'''
|900-999
|-
|'''o'''
|1000-1099
|-
|'''p'''
|1100-1199
|-
|'''q'''
|1200-1299
|-
|'''r'''
|1300-1399
|-
|'''s'''
|1400-1499
|-
|'''t'''
|1500-1599
|-
|'''u'''
|1600-1699
|-
|'''v'''
|1700-1799
|-
|'''w'''
|1800-1899
|-
|'''x'''
|1900-1999
|-
|'''y'''
|2000-2099
|}


:::For '''B.C. dates''', the lowercase alphabetic character represents the millennium and the digit represents the century. If the century is not known, a hyphen (-) is used instead of a number. A single century or a period within a century is coded by repeating the appropriate two-character code to create the required four-characters.
									
::::151 	#0$aRome$xHistory$yRepublic, 265-30 B.C.
::::'''045''' 	##$ad7d9
									
::::150 	#0$aBronze age
::::'''045''' 	##$aa-c-
:::::''[3000-1000 B.C.]''
									
::::151 	##$aEgypt$xHistory$yEighteenth dynasty, ca. 1570-1320 B.C.
::::'''045''' 	##$ac4c6

:::For '''C.E. dates''', the lowercase alphabetic character represents the century. A digit (0-9) is added to represent the decade. If the decade is not known, a hyphen (-) is used instead of a number. A single year or a period within a decade is coded by repeating the appropriate two-character code to create the required four characters.
									
::::151 	#0$aGreat Britain$xHistory$yMedieval period, 1066-1485.
::::'''045''' 	##$ao6s8
									
::::150 	#0$aBhopal Union Carbide Plant Disaster, Bhopal, India, 1984.
::::'''045''' 	##$ax8x8
									
::::150 	#0$aCivilization, Modern$y20th century.
::::'''045''' 	##$ax-x-
									
::::150 	#0$aCatalan literature$y16th-18th centuries.
::::'''045''' 	##$at-v-
									
::::151 	##$aGreece$xHistory$y146 B.C.-323 C.E.
::::'''045''' 	##$ad8h2
									
::::150 	##$aTwenty-first century$xForecasts.
::::'''045''' 	##$ay-y-

::'''$b - Formatted 9999 B.C. through C.E. time period'''
:::Specific time period formatted as yyyymmddhh, preceded by a code for the era (c for B.C.; d for C.E.).

:::Era and year are required components; the month, day, and hour are optional.

:::*era expressed as a code: c (B.C.), d (C.E.)
:::*year expressed as a four-digit number (0000 to 9999) right justified; unused positions contain zeros
:::*month expressed as a two-digit number (01 to 12) right justified; unused positions contain zeros
:::*day expressed as a two-digit number (01 to 31) right justified; unused positions contain zeros
:::*hour expressed as a two-digit number using the 24-hour clock (00 to 23) right justified; unused positions contain zeros

:::First indicator position values 0-2 specify whether the time period in subfield $b is a single date, multiple dates, or a range of dates. Each 9999 B.C. through C.E. time period associated with the heading is contained in a separate subfield $b.
									
::::151 	##$aFrance$xHistory$yRevolution, 1791-1797
::::'''045''' 	2#$bd1791$bd1797
									
::::151 	##$aJapan$xHistory$yFebruary Incident, 1936 (February 26)
::::'''045''' 	0#$bd19360226
									
::::151 	##$aChina$xHistory$y221 B.C.-960 C.E.
::::'''045''' 	2#$ad7n6$bc0221$bd0960

::'''$c - Formatted pre-9999 B.C. time period'''
:::Formatted time period that consists of as many numeric characters as are needed to represent the number of pre-9999 years B.C.
:::First indicator position values 0-2 specify whether the time period in subfield $c is a single date, multiple dates, or a range of dates. Each pre-9999 B.C. time period associated with the heading is contained in a separate subfield $c.
									
::::150 	##$aGeology, Stratigraphic$yMesozoic
::::'''045''' 	2#$c225000000$c70000000

::'''$6 - Linkage'''
:::See description of this subfield in Appendix A: [http://www.loc.gov/marc/authority/ecadcntf.html Control Subfields].

::'''$8 - Field link and sequence number'''
:::See description of this subfield in Appendix A: [http://www.loc.gov/marc/authority/ecadcntf.html Control Subfields].