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edited by Helena
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... ... @@ -18,7 +18,7 @@
18 18  
19 19  This section does not explain the VTL language or any of the content published in the VTL guides. Rather, this is a description of how the VTL can be used in the SDMX context and applied to SDMX artefacts.
20 20  
21 -== 12.2 References to SDMX artefacts from VTL statements ==
21 +== 12.2 References to SDMX artefacts from VTL statements ==
22 22  
23 23  === 12.2.1 Introduction ===
24 24  
... ... @@ -116,7 +116,7 @@
116 116  
117 117  by omitting all the non-essential parts would become simply:
118 118  
119 -> DFR : = DF1 + DF2
119 +> DFR  : =  DF1 + DF2
120 120  
121 121  The references to the Codelists can be simplified similarly. For example, given the non-abbreviated reference to the Codelist AG:CL_FREQ(1.0.0), which is{{footnote}}Single quotes are needed because this reference is not a VTL regular name. 19 Single quotes are not needed in this case because CL_FREQ is a VTL regular name.{{/footnote}}:
122 122  
... ... @@ -452,26 +452,31 @@
452 452  
453 453  > ‘DF2(1.0.0)/GDPPERCAPITA.USA’ <- expression11; ‘DF2(1.0.0)/GDPPERCAPITA.CANADA’ <- expression12;
454 454  > … … …
455 -> ‘DF2(1.0.0)/POPGROWTH.USA’ <- expression21;
455 +> ‘DF2(1.0.0)/POPGROWTH.USA’ <- expression21;
456 456  > ‘DF2(1.0.0)/POPGROWTH.CANADA’ <- expression22;
457 457  > … … …
458 458  
459 459  As said, it is assumed that these VTL derived Data Sets have the TIME_PERIOD as the only identifier. In the mapping from VTL to SMDX, the Dimensions INDICATOR and COUNTRY are added to the VTL data structure on order to obtain the SDMX one, with the following values respectively:
460 460  
461 -> VTL dataset INDICATOR value COUNTRY value
462 ->
463 -> ‘DF2(1.0.0)/GDPPERCAPITA.USA’ GDPPERCAPITA USA
461 +VTL dataset   INDICATOR value COUNTRY value
462 +
463 +> ‘DF2(1.0.0)/GDPPERCAPITA.USA’ GDPPERCAPITA USA
464 464  > ‘DF2(1.0.0)/GDPPERCAPITA.CANADA’ GDPPERCAPITA CANADA … … …
465 ->
466 -> ‘DF2(1.0.0)/POPGROWTH.USA’ POPGROWTH USA
467 -> ‘DF2(1.0.0)/POPGROWTH.CANADA’ POPGROWTH CANADA
465 +> ‘DF2(1.0.0)/POPGROWTH.USA’  POPGROWTH USA
466 +> ‘DF2(1.0.0)/POPGROWTH.CANADA’ POPGROWTH CANADA
468 468  > … … …
469 469  
470 470  It should be noted that the application of this many-to-one mapping from VTL to SDMX is equivalent to an appropriate sequence of VTL Transformations. These use the VTL operator “calc” to add the proper VTL identifiers (in the example, INDICATOR and COUNTRY) and to assign to them the proper values and the operator “union” in order to obtain the final VTL dataset (in the example DF2(1.0.0)), that can be mapped oneto-one to the homonymous SDMX Dataflow. Following the same example, these VTL Transformations would be:
471 471  
472 -> DF2bis_GDPPERCAPITA_USA := ‘DF2(1.0.0)/GDPPERCAPITA.USA’ [calc identifier INDICATOR := ”GDPPERCAPITA”, identifier COUNTRY := ”USA”]; DF2bis_GDPPERCAPITA_CANADA := ‘DF2(1.0.0)/GDPPERCAPITA.CANADA’ [calc identifier INDICATOR:=”GDPPERCAPITA”, identifier COUNTRY:=”CANADA”];… … … DF2bis_POPGROWTH_USA := ‘DF2(1.0.0)/POPGROWTH.USA’ [calc identifier INDICATOR := ”POPGROWTH”, identifier COUNTRY := ”USA”]; DF2bis_POPGROWTH_CANADA’ := ‘DF2(1.0.0)/POPGROWTH.CANADA’ [calc identifier INDICATOR := ”POPGROWTH”, identifier COUNTRY := ”CANADA”];… … … DF2(1.0) <- UNION (DF2bis_GDPPERCAPITA_USA’, DF2bis_GDPPERCAPITA_CANADA’,
471 +> DF2bis_GDPPERCAPITA_USA := ‘DF2(1.0.0)/GDPPERCAPITA.USA’ [calc identifier INDICATOR := ”GDPPERCAPITA”, identifier COUNTRY := ”USA”];
472 +> DF2bis_GDPPERCAPITA_CANADA := ‘DF2(1.0.0)/GDPPERCAPITA.CANADA’ [calc identifier INDICATOR:=”GDPPERCAPITA”, identifier COUNTRY:=”CANADA”]; … … …
473 +> DF2bis_POPGROWTH_USA := ‘DF2(1.0.0)/POPGROWTH.USA’  [calc identifier INDICATOR := ”POPGROWTH”, identifier COUNTRY := ”USA”];
474 +> DF2bis_POPGROWTH_CANADA’ := ‘DF2(1.0.0)/POPGROWTH.CANADA’ [calc identifier INDICATOR := ”POPGROWTH”, identifier COUNTRY := ”CANADA”]; … … …
475 +> DF2(1.0) <- UNION  (DF2bis_GDPPERCAPITA_USA’,
476 +> DF2bis_GDPPERCAPITA_CANADA’,
473 473  > … ,
474 -> DF2bis_POPGROWTH_USA’, DF2bis_POPGROWTH_CANADA’
478 +> DF2bis_POPGROWTH_USA’,
479 +> DF2bis_POPGROWTH_CANADA’
475 475  > …);
476 476  
477 477  In other words, starting from the datasets explicitly calculated through VTL (in the example ‘DF2(1.0)/GDPPERCAPITA.USA’ and so on), the first step consists in calculating other (non-persistent) VTL datasets (in the example DF2bis_GDPPERCAPITA_USA and so on) by adding the identifiers INDICATOR and COUNTRY with the desired values (//INDICATORvalue// and //COUNTRYvalue)//. Finally, all these non-persistent Data Sets are united and give the final result DF2(1.0){{footnote}}The result is persistent in this example but it can be also non persistent if needed.{{/footnote}}, which can be mapped one-to-one to the homonymous SDMX Dataflow having the dimension components TIME_PERIOD, INDICATOR and COUNTRY.
... ... @@ -538,8 +538,6 @@
538 538  
539 539  The VTL basic scalar types are listed below and follow a hierarchical structure in terms of supersets/subsets (e.g. "scalar" is the superset of all the basic scalar types):
540 540  
541 -[[image:1750070310572-584.png]]
542 -
543 543  **Figure 23 – VTL Basic Scalar Types**
544 544  
545 545  === 12.4.2 VTL basic scalar types and SDMX data types ===
... ... @@ -564,157 +564,158 @@
564 564  
565 565  The following table describes the default mapping for converting from the SDMX data types to the VTL basic scalar types.
566 566  
567 -(% style="width:583.294px" %)
568 -|(% style="width:360px" %)SDMX data type (BasicComponentDataType)|(% style="width:221px" %)Default VTL basic scalar type
569 -|(% style="width:360px" %)(((
570 +|SDMX data type (BasicComponentDataType)|Default VTL basic scalar type
571 +|(((
570 570  String
571 571  (string allowing any character)
572 -)))|(% style="width:221px" %)string
573 -|(% style="width:360px" %)(((
574 -Alpha
574 +)))|string
575 +|(((
576 +Alpha 
577 +
575 575  (string which only allows A-z)
576 -)))|(% style="width:221px" %)string
577 -|(% style="width:360px" %)(((
579 +)))|string
580 +|(((
578 578  AlphaNumeric
579 579  (string which only allows A-z and 0-9)
580 -)))|(% style="width:221px" %)string
581 -|(% style="width:360px" %)(((
583 +)))|string
584 +|(((
582 582  Numeric
586 +
583 583  (string which only allows 0-9, but is not numeric so that is can having leading zeros)
584 -)))|(% style="width:221px" %)string
585 -|(% style="width:360px" %)(((
588 +)))|string
589 +|(((
586 586  BigInteger
587 587  (corresponds to XML Schema xs:integer datatype; infinite set of integer values)
588 -)))|(% style="width:221px" %)integer
589 -|(% style="width:360px" %)(((
592 +)))|integer
593 +|(((
590 590  Integer
591 591  (corresponds to XML Schema xs:int datatype; between -2147483648 and +2147483647
592 592  (inclusive))
593 -)))|(% style="width:221px" %)integer
594 -|(% style="width:360px" %)(((
597 +)))|integer
598 +|(((
595 595  Long
596 596  (corresponds to XML Schema xs:long datatype; between -9223372036854775808 and
597 597  +9223372036854775807 (inclusive))
598 -)))|(% style="width:221px" %)integer
599 -|(% style="width:360px" %)(((
602 +)))|integer
603 +|(((
600 600  Short
601 601  (corresponds to XML Schema xs:short datatype; between -32768 and -32767 (inclusive))
602 -)))|(% style="width:221px" %)integer
603 -|(% style="width:360px" %)Decimal (corresponds to XML Schema xs:decimal datatype; subset of real numbers that can be represented as decimals)|(% style="width:221px" %)number
604 -|(% style="width:360px" %)(((
606 +)))|integer
607 +|Decimal (corresponds to XML Schema xs:decimal datatype; subset of real numbers that can be represented as decimals)|number
608 +|(((
605 605  Float
606 606  (corresponds to XML Schema xs:float datatype; patterned after the IEEE single-precision 32-bit floating point type)
607 -)))|(% style="width:221px" %)number
608 -|(% style="width:360px" %)(((
611 +)))|number
612 +|(((
609 609  Double
610 610  (corresponds to XML Schema xs:double datatype; patterned after the IEEE double-precision 64-bit floating point type)
611 -)))|(% style="width:221px" %)number
612 -|(% style="width:360px" %)(((
615 +)))|number
616 +|(((
613 613  Boolean
614 614  (corresponds to the XML Schema xs:boolean datatype; support the mathematical concept of
615 615  binary-valued logic: {true, false})
616 -)))|(% style="width:221px" %)boolean
617 -|(% style="width:360px" %)(((
620 +)))|boolean
621 +|(((
618 618  URI
619 619  (corresponds to the XML Schema xs:anyURI; absolute or relative Uniform Resource Identifier Reference)
620 -)))|(% style="width:221px" %)string
621 -|(% style="width:360px" %)(((
624 +)))|string
625 +|(((
622 622  Count
623 623  (an integer following a sequential pattern, increasing by 1 for each occurrence)
624 -)))|(% style="width:221px" %)integer
625 -|(% style="width:360px" %)(((
628 +)))|integer
629 +|(((
626 626  InclusiveValueRange
627 627  (decimal number within a closed interval, whose bounds are specified in the SDMX representation by the facets minValue and maxValue)
628 -)))|(% style="width:221px" %)number
629 -|(% style="width:360px" %)(((
632 +)))|number
633 +|(((
630 630  ExclusiveValueRange
631 631  (decimal number within an open interval, whose bounds are specified in the SDMX representation by the facets minValue and maxValue)
632 -)))|(% style="width:221px" %)number
633 -|(% style="width:360px" %)(((
636 +)))|number
637 +|(((
634 634  Incremental
635 635  (decimal number the increased by a specific interval (defined by the interval facet), which is typically enforced outside of the XML validation)
636 -)))|(% style="width:221px" %)number
637 -|(% style="width:360px" %)(((
640 +)))|number
641 +|(((
638 638  ObservationalTimePeriod
639 639  (superset of StandardTimePeriod and TimeRange)
640 -)))|(% style="width:221px" %)time
641 -|(% style="width:360px" %)(((
644 +)))|time
645 +|(((
642 642  StandardTimePeriod
643 643  (superset of BasicTimePeriod and ReportingTimePeriod)
644 -)))|(% style="width:221px" %)time
645 -|(% style="width:360px" %)(((
648 +)))|time
649 +|(((
646 646  BasicTimePeriod
647 647  (superset of GregorianTimePeriod and DateTime)
648 -)))|(% style="width:221px" %)date
649 -|(% style="width:360px" %)(((
652 +)))|date
653 +|(((
650 650  GregorianTimePeriod
651 651  (superset of GregorianYear, GregorianYearMonth, and GregorianDay)
652 -)))|(% style="width:221px" %)date
653 -|(% style="width:360px" %)GregorianYear (YYYY)|(% style="width:221px" %)date
654 -|(% style="width:360px" %)GregorianYearMonth / GregorianMonth (YYYY-MM)|(% style="width:221px" %)date
655 -|(% style="width:360px" %)GregorianDay (YYYY-MM-DD)|(% style="width:221px" %)date
656 -|(% style="width:360px" %)(((
656 +)))|date
657 +|GregorianYear (YYYY)|date
658 +|GregorianYearMonth / GregorianMonth (YYYY-MM)|date
659 +|GregorianDay (YYYY-MM-DD)|date
660 +|(((
657 657  ReportingTimePeriod
658 658  (superset of RepostingYear, ReportingSemester, ReportingTrimester, ReportingQuarter, ReportingMonth, ReportingWeek, ReportingDay)
659 -)))|(% style="width:221px" %)time_period
660 -|(% style="width:360px" %)(((
663 +)))|time_period
664 +|(((
661 661  ReportingYear
662 662  (YYYY-A1 – 1 year period)
663 -)))|(% style="width:221px" %)time_period
664 -|(% style="width:360px" %)(((
667 +)))|time_period
668 +|(((
665 665  ReportingSemester
666 666  (YYYY-Ss – 6 month period)
667 -)))|(% style="width:221px" %)time_period
668 -|(% style="width:360px" %)(((
671 +)))|time_period
672 +|(((
669 669  ReportingTrimester
670 670  (YYYY-Tt – 4 month period)
671 -)))|(% style="width:221px" %)time_period
672 -|(% style="width:360px" %)(((
675 +)))|time_period
676 +|(((
673 673  ReportingQuarter
674 674  (YYYY-Qq – 3 month period)
675 -)))|(% style="width:221px" %)time_period
676 -|(% style="width:360px" %)(((
679 +)))|time_period
680 +|(((
677 677  ReportingMonth
678 678  (YYYY-Mmm – 1 month period)
679 -)))|(% style="width:221px" %)time_period
680 -|(% style="width:360px" %)ReportingWeek|(% style="width:221px" %)time_period
681 -|(% style="width:360px" %) (YYYY-Www – 7 day period; following ISO 8601 definition of a week in a year)|(% style="width:221px" %)
682 -|(% style="width:360px" %)(((
683 +)))|time_period
684 +|ReportingWeek|time_period
685 +| (YYYY-Www – 7 day period; following ISO 8601 definition of a week in a year)|
686 +|(((
683 683  ReportingDay
684 684  (YYYY-Dddd – 1 day period)
685 -)))|(% style="width:221px" %)time_period
686 -|(% style="width:360px" %)(((
689 +)))|time_period
690 +|(((
687 687  DateTime
688 688  (YYYY-MM-DDThh:mm:ss)
689 -)))|(% style="width:221px" %)date
690 -|(% style="width:360px" %)(((
693 +)))|date
694 +|(((
691 691  TimeRange
692 692  (YYYY-MM-DD(Thh:mm:ss)?/<duration>)
693 -)))|(% style="width:221px" %)time
694 -|(% style="width:360px" %)(((
697 +)))|time
698 +|(((
695 695  Month
696 696  (~-~-MM; speicifies a month independent of a year; e.g. February is black history month in the United States)
697 -)))|(% style="width:221px" %)string
698 -|(% style="width:360px" %)(((
701 +)))|string
702 +|(((
699 699  MonthDay
700 700  (~-~-MM-DD; specifies a day within a month independent of a year; e.g. Christmas is December 25^^th^^; used to specify reporting year start day)
701 -)))|(% style="width:221px" %)string
702 -|(% style="width:360px" %)(((
705 +)))|string
706 +|(((
703 703  Day
704 704  (~-~--DD; specifies a day independent of a month or year; e.g. the 15^^th^^ is payday)
705 -)))|(% style="width:221px" %)string
706 -|(% style="width:360px" %)(((
709 +)))|string
710 +|(((
707 707  Time
708 708  (hh:mm:ss; time independent of a date; e.g. coffee break is at 10:00 AM)
709 -)))|(% style="width:221px" %)string
710 -|(% style="width:360px" %)(((
713 +)))|string
714 +|(((
711 711  Duration
712 712  (corresponds to XML Schema xs:duration datatype)
713 -)))|(% style="width:221px" %)duration
714 -|(% style="width:360px" %)XHTML|(% style="width:221px" %)Metadata type – not applicable
715 -|(% style="width:360px" %)KeyValues|(% style="width:221px" %)Metadata type – not applicable
716 -|(% style="width:360px" %)IdentifiableReference|(% style="width:221px" %)Metadata type – not applicable
717 -|(% style="width:360px" %)DataSetReference|(% style="width:221px" %)Metadata type – not applicable
717 +)))|duration
718 +|XHTML|Metadata type – not applicable
719 +|KeyValues|Metadata type – not applicable
720 +|IdentifiableReference|Metadata type – not applicable
721 +|DataSetReference|Metadata type – not applicable
718 718  
719 719  **Figure 14 – Mappings from SDMX data types to VTL Basic Scalar Types**
720 720  
... ... @@ -724,82 +724,84 @@
724 724  
725 725  The following table describes the default conversion from the VTL basic scalar types to the SDMX data types .
726 726  
727 -(% style="width:748.294px" %)
728 -|(% style="width:164px" %)(((
729 -VTL basic scalar type
730 -)))|(% style="width:304px" %)(((
731 +|(((
732 +VTL basic
733 +scalar type
734 +)))|(((
731 731  Default SDMX data type
732 -(BasicComponentDataType)
733 -)))|(% style="width:277px" %)Default output format
734 -|(% style="width:164px" %)String|(% style="width:304px" %)String|(% style="width:277px" %)Like XML (xs:string)
735 -|(% style="width:164px" %)Number|(% style="width:304px" %)Float|(% style="width:277px" %)Like XML (xs:float)
736 -|(% style="width:164px" %)Integer|(% style="width:304px" %)Integer|(% style="width:277px" %)Like XML (xs:int)
737 -|(% style="width:164px" %)Date|(% style="width:304px" %)DateTime|(% style="width:277px" %)YYYY-MM-DDT00:00:00Z
738 -|(% style="width:164px" %)Time|(% style="width:304px" %)StandardTimePeriod|(% style="width:277px" %)<date>/<date> (as defined above)
739 -|(% style="width:164px" %)time_period|(% style="width:304px" %)(((
736 +(BasicComponentDataType
737 +)
738 +)))|Default output format
739 +|String|String|Like XML (xs:string)
740 +|Number|Float|Like XML (xs:float)
741 +|Integer|Integer|Like XML (xs:int)
742 +|Date|DateTime|YYYY-MM-DDT00:00:00Z
743 +|Time|StandardTimePeriod|<date>/<date> (as defined above)
744 +|time_period|(((
740 740  ReportingTimePeriod
741 741  (StandardReportingPeriod)
742 -)))|(% style="width:277px" %)(((
747 +)))|(((
743 743   YYYY-Pppp
744 744  (according to SDMX )
745 745  )))
746 -|(% style="width:164px" %)Duration|(% style="width:304px" %)Duration|(% style="width:277px" %)Like XML (xs:duration) PnYnMnDTnHnMnS
747 -|(% style="width:164px" %)Boolean|(% style="width:304px" %)Boolean|(% style="width:277px" %)Like XML (xs:boolean) with the values "true" or "false"
751 +|Duration|Duration|Like XML (xs:duration) PnYnMnDTnHnMnS
752 +|Boolean|Boolean|Like XML (xs:boolean) with the values "true" or "false"
748 748  
749 749  **Figure 14 – Mappings from SDMX data types to VTL Basic Scalar Types**
750 750  
751 -In case a different default conversion is desired, it can be achieved through the CustomTypeScheme and CustomType artefacts (see also the section Transformations and Expressions of the SDMX information model).
756 +In case a different default conversion is desired, it can be achieved through the CustomTypeScheme and CustomType artefacts (see also the section
752 752  
758 +Transformations and Expressions of the SDMX information model).
759 +
753 753  The custom output formats can be specified by means of the VTL formatting mask described in the section "Type Conversion and Formatting Mask" of the VTL Reference Manual. Such a section describes the masks for the VTL basic scalar types "number", "integer", "date", "time", "time_period" and "duration" and gives examples. As for the types "string" and "boolean" the VTL conventions are extended with some other special characters as described in the following table.
754 754  
755 -(% style="width:717.294px" %)
756 -|(% colspan="2" style="width:714px" %)VTL special characters for the formatting masks
757 -|(% colspan="2" style="width:714px" %)
758 -|(% colspan="2" style="width:714px" %)Number
759 -|(% style="width:122px" %)D|(% style="width:591px" %)one numeric digit (if the scientific notation is adopted, D is only for the mantissa)
760 -|(% style="width:122px" %)E|(% style="width:591px" %)one numeric digit (for the exponent of the scientific notation)
761 -|(% style="width:122px" %). (dot)|(% style="width:591px" %)possible separator between the integer and the decimal parts.
762 -|(% style="width:122px" %), (comma)|(% style="width:591px" %)possible separator between the integer and the decimal parts.
763 -|(% style="width:122px" %) |(% style="width:591px" %)
764 -|(% colspan="2" style="width:714px" %)Time and duration
765 -|(% style="width:122px" %)C|(% style="width:591px" %)century
766 -|(% style="width:122px" %)Y|(% style="width:591px" %)year
767 -|(% style="width:122px" %)S|(% style="width:591px" %)semester
768 -|(% style="width:122px" %)Q|(% style="width:591px" %)quarter
769 -|(% style="width:122px" %)M|(% style="width:591px" %)month
770 -|(% style="width:122px" %)W|(% style="width:591px" %)week
771 -|(% style="width:122px" %)D|(% style="width:591px" %)day
772 -|(% style="width:122px" %)h|(% style="width:591px" %)hour digit (by default on 24 hours)
773 -|(% style="width:122px" %)M|(% style="width:591px" %)minute
774 -|(% style="width:122px" %)S|(% style="width:591px" %)second
775 -|(% style="width:122px" %)D|(% style="width:591px" %)decimal of second
776 -|(% style="width:122px" %)P|(% style="width:591px" %)period indicator (representation in one digit for the duration)
777 -|(% style="width:122px" %)P|(% style="width:591px" %)number of the periods specified in the period indicator
778 -|(% style="width:122px" %)AM/PM|(% style="width:591px" %)indicator of AM / PM (e.g. am/pm for "am" or "pm")
779 -|(% style="width:122px" %)MONTH|(% style="width:591px" %)uppercase textual representation of the month (e.g., JANUARY for January)
780 -|(% style="width:122px" %)DAY|(% style="width:591px" %)uppercase textual representation of the day (e.g., MONDAY for Monday)
781 -|(% style="width:122px" %)Month|(% style="width:591px" %)lowercase textual representation of the month (e.g., january)
782 -|(% style="width:122px" %)Day|(% style="width:591px" %)lowercase textual representation of the month (e.g., monday)
783 -|(% style="width:122px" %)Month|(% style="width:591px" %)First character uppercase, then lowercase textual representation of the month (e.g., January)
784 -|(% style="width:122px" %)Day|(% style="width:591px" %)First character uppercase, then lowercase textual representation of the day using (e.g. Monday)
785 -|(% style="width:122px" %) |(% style="width:591px" %)
786 -|(% colspan="2" style="width:714px" %)String
787 -|(% style="width:122px" %)X|(% style="width:591px" %)any string character
788 -|(% style="width:122px" %)Z|(% style="width:591px" %)any string character from "A" to "z"
789 -|(% style="width:122px" %)9|(% style="width:591px" %)any string character from "0" to "9"
790 -|(% style="width:122px" %) |(% style="width:591px" %)
791 -|(% colspan="2" style="width:714px" %)Boolean
792 -|(% style="width:122px" %)B|(% style="width:591px" %)Boolean using "true" for True and "false" for False
793 -|(% style="width:122px" %)1|(% style="width:591px" %)Boolean using "1" for True and "0" for False
794 -|(% style="width:122px" %)0|(% style="width:591px" %)Boolean using "0" for True and "1" for False
795 -|(% style="width:122px" %) |(% style="width:591px" %)
796 -|(% colspan="2" style="width:714px" %)Other qualifiers
797 -|(% style="width:122px" %)*|(% style="width:591px" %)an arbitrary number of digits (of the preceding type)
798 -|(% style="width:122px" %)+|(% style="width:591px" %)at least one digit (of the preceding type)
799 -|(% style="width:122px" %)( )|(% style="width:591px" %)optional digits (specified within the brackets)
800 -|(% style="width:122px" %)\|(% style="width:591px" %)prefix for the special characters that must appear in the mask
801 -|(% style="width:122px" %)N|(% style="width:591px" %)fixed number of digits used in the preceding textual representation of the month or the day
802 -|(% style="width:122px" %) |(% style="width:591px" %)
762 +|(% colspan="2" %)VTL special characters for the formatting masks
763 +|(% colspan="2" %)
764 +|(% colspan="2" %)Number
765 +|D|one numeric digit (if the scientific notation is adopted, D is only for the mantissa)
766 +|E|one numeric digit (for the exponent of the scientific notation)
767 +|. (dot)|possible separator between the integer and the decimal parts.
768 +|, (comma)|possible separator between the integer and the decimal parts.
769 +| |
770 +|(% colspan="2" %)Time and duration
771 +|C|century
772 +|Y|year
773 +|S|semester
774 +|Q|quarter
775 +|M|month
776 +|W|week
777 +|D|day
778 +|h|hour digit (by default on 24 hours)
779 +|M|minute
780 +|S|second
781 +|D|decimal of second
782 +|P|period indicator (representation in one digit for the duration)
783 +|P|number of the periods specified in the period indicator
784 +|AM/PM|indicator of AM / PM (e.g. am/pm for "am" or "pm")
785 +|MONTH|uppercase textual representation of the month (e.g., JANUARY for January)
786 +|DAY|uppercase textual representation of the day (e.g., MONDAY for Monday)
787 +|Month|lowercase textual representation of the month (e.g., january)
788 +|Day|lowercase textual representation of the month (e.g., monday)
789 +|Month|First character uppercase, then lowercase textual representation of the month (e.g., January)
790 +|Day|First character uppercase, then lowercase textual representation of the day using (e.g. Monday)
791 +| |
792 +|(% colspan="2" %)String
793 +|X|any string character
794 +|Z|any string character from "A" to "z"
795 +|9|any string character from "0" to "9"
796 +| |
797 +|(% colspan="2" %)Boolean
798 +|B|Boolean using "true" for True and "false" for False
799 +|1|Boolean using "1" for True and "0" for False
800 +|0|Boolean using "0" for True and "1" for False
801 +| |
802 +|(% colspan="2" %)Other qualifiers
803 +|*|an arbitrary number of digits (of the preceding type)
804 +|+|at least one digit (of the preceding type)
805 +|( )|optional digits (specified within the brackets)
806 +|\|prefix for the special characters that must appear in the mask
807 +|N|fixed number of digits used in the preceding textual representation of the month or the day
808 +| |
803 803  
804 804  The default conversion, either standard or customized, can be used to deduce automatically the representation of the components of the result of a VTL Transformation. In alternative, the representation of the resulting SDMX Dataflow can be given explicitly by providing its DataStructureDefinition. In other words, the representation specified in the DSD, if available, overrides any default conversion{{footnote}}The representation given in the DSD should obviously be compatible with the VTL data type.{{/footnote}}.
805 805  
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