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... ... @@ -14,8 +14,10 @@
14 14  
15 15  The VTL language can be applied to SDMX artefacts by mapping the SDMX IM model artefacts to the model artefacts that VTL can manipulate{{footnote}}In this chapter, in order to distinguish VTL and SDMX model artefacts, the VTL ones are written in the Arial font while the SDMX ones in Courier New{{/footnote}}. Thus, the SDMX artefacts can be used in VTL as inputs and/or outputs of Transformations. It is important to be aware that the artefacts do not always have the same names in the SDMX and VTL IMs, nor do they always have the same meaning. The more evident example is given by the SDMX Dataset and the VTL "Data Set", which do not correspond one another: as a matter of fact, the VTL "Data Set" maps to the SDMX "Dataflow", while the SDMX "Dataset" has no explicit mapping to VTL (such an abstraction is not needed in the definition of VTL Transformations). A SDMX "Dataset", however, is an instance of a SDMX "Dataflow" and can be the artefact on which the VTL transformations are executed (i.e., the Transformations are defined on Dataflows and are applied to Dataflow instances that can be Datasets).
16 16  
17 -The VTL programs (Transformation Schemes) are represented in SDMX through the TransformationScheme maintainable class which is composed of Transformation (nameable artefact). Each Transformation assigns the outcome of the evaluation of a VTL expression to a result.
17 +The VTL programs (Transformation Schemes) are represented in SDMX through the TransformationScheme maintainable class which is composed of
18 18  
19 +Transformation (nameable artefact). Each Transformation assigns the outcome of the evaluation of a VTL expression to a result.
20 +
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 21  == 12.2 References to SDMX artefacts from VTL statements ==
... ... @@ -26,8 +26,10 @@
26 26  
27 27  The alias of an SDMX artefact can be its URN (Universal Resource Name), an abbreviation of its URN or another user-defined name.
28 28  
29 -In any case, the aliases used in the VTL Transformations have to be mapped to the SDMX artefacts through the VtlMappingScheme and VtlMapping classes (see the section of the SDMX IM relevant to the VTL). A VtlMapping allows specifying the aliases to be used in the VTL Transformations, Rulesets{{footnote}}See also the section "VTL-DL Rulesets" in the VTL Reference Manual.{{/footnote}} or User Defined Operators{{footnote}}The VTLMappings are used also for User Defined Operators (UDO). Although UDOs are envisaged to be defined on generic operands, so that the specific artefacts to be manipulated are passed as parameters at their invocation, it is also possible that an UDO invokes directly some specific SDMX artefacts. These SDMX artefacts have to be mapped to the corresponding aliases used in the definition of the UDO through the VtlMappingScheme and VtlMapping classes as well.{{/footnote}} to reference SDMX artefacts. A VtlMappingScheme is a container for zero or more VtlMapping.
31 +In any case, the aliases used in the VTL Transformations have to be mapped to the
30 30  
33 +SDMX artefacts through the VtlMappingScheme and VtlMapping classes (see the section of the SDMX IM relevant to the VTL). A VtlMapping allows specifying the aliases to be used in the VTL Transformations, Rulesets{{footnote}}See also the section "VTL-DL Rulesets" in the VTL Reference Manual.{{/footnote}} or User Defined Operators{{footnote}}The VTLMappings are used also for User Defined Operators (UDO). Although UDOs are envisaged to be defined on generic operands, so that the specific artefacts to be manipulated are passed as parameters at their invocation, it is also possible that an UDO invokes directly some specific SDMX artefacts. These SDMX artefacts have to be mapped to the corresponding aliases used in the definition of the UDO through the VtlMappingScheme and VtlMapping classes as well.{{/footnote}} to reference SDMX artefacts. A VtlMappingScheme is a container for zero or more VtlMapping.
34 +
31 31  The correspondence between an alias and a SDMX artefact must be one-to-one, meaning that a generic alias identifies one and just one SDMX artefact while a SDMX artefact is identified by one and just one alias. In other words, within a VtlMappingScheme an artefact can have just one alias and different artefacts cannot have the same alias.
32 32  
33 33  The references through the URN and the abbreviated URN are described in the following paragraphs.
... ... @@ -198,7 +198,7 @@
198 198  
199 199  === 12.3.3 Mapping from SDMX to VTL data structures ===
200 200  
201 -==== 12.3.3.1 Basic Mapping ====
205 +**12.3.3.1 Basic Mapping**
202 202  
203 203  The main mapping method from SDMX to VTL is called **Basic **mapping. This is considered as the default mapping method and is applied unless a different method is specified through the VtlMappingScheme and VtlDataflowMapping classes. When transforming **from SDMX to VTL**, this method consists in leaving the components unchanged and maintaining their names and roles, according to the following table:
204 204  
... ... @@ -228,11 +228,18 @@
228 228  The SDMX structures that contain a MeasureDimension are mapped as described below (this mapping is equivalent to a pivoting operation):
229 229  
230 230  * A SDMX simple dimension becomes a VTL (simple) identifier and a SDMX TimeDimension becomes a VTL (time) identifier;
231 -* Each possible Code Cj of the SDMX MeasureDimension is mapped to a VTL Measure, having the same name as the SDMX Code (i.e. Cj); the VTL Measure Cj is a new VTL component even if the SDMX data structure has not such a Component;
235 +* Each possible Code Cj of the SDMX MeasureDimension is mapped to a VTL Measure, having the same name as the SDMX Code (i.e. Cj); the VTL Measure Cj is a new VTL component even if the SDMX data structure has not such a
236 +
237 +Component;
238 +
232 232  * The SDMX MeasureDimension is not mapped to VTL (it disappears in the VTL Data Structure);
233 233  * The SDMX Measure is not mapped to VTL as well (it disappears in the VTL Data Structure);
234 234  * An SDMX DataAttribute is mapped in different ways according to its AttributeRelationship:
235 -** If, according to the SDMX AttributeRelationship, the values of the DataAttribute do not depend on the values of the MeasureDimension, the SDMX DataAttribute becomes a VTL Attribute having the same name. This happens if the AttributeRelationship is not specified (i.e. the DataAttribute does not depend on any DimensionComponent and therefore is at data set level), or if it refers to a set (or a group) of dimensions which does not include the MeasureDimension;
242 +** If, according to the SDMX AttributeRelationship, the values of the DataAttribute do not depend on the values of the MeasureDimension, the SDMX DataAttribute becomes a VTL Attribute having the same name. This happens if the
243 +
244 +AttributeRelationship is not specified (i.e. the DataAttribute does not depend on any DimensionComponent and therefore is at data set level), or if it refers to a set (or a group) of dimensions which does not include the MeasureDimension;
245 +
246 +*
236 236  ** Otherwise, if, according to the SDMX AttributeRelationship, the values of the DataAttribute depend on the MeasureDimension, the SDMX DataAttribute is mapped to one VTL Attribute for each possible Code of the SDMX MeasureDimension. By default, the names of the VTL Attributes are obtained by concatenating the name of the SDMX DataAttribute and the names of the correspondent Code of the MeasureDimension separated by underscore. For example, if the SDMX DataAttribute is named DA and the possible Codes of the SDMX MeasureDimension are named C1, C2, …, Cn, then the corresponding VTL Attributes will be named DA_C1, DA_C2, …, DA_Cn (if different names are desired, they can be achieved afterwards by renaming the Attributes through VTL operators).
237 237  ** Like in the Basic mapping, the resulting VTL Attributes are considered as dependent on all the VTL identifiers (i.e. "at data point / observation level"), because VTL does not have the SDMX notion of Attribute Relationship.
238 238  
... ... @@ -255,7 +255,10 @@
255 255  At observation / data point level, calling Cj (j=1, … n) the j^^th^^ Code of the MeasureDimension:
256 256  
257 257  * The set of SDMX observations having the same values for all the Dimensions except than the MeasureDimension become one multi-measure VTL Data Point, having one Measure for each Code Cj of the SDMX MeasureDimension;
258 -* The values of the SDMX simple Dimensions, TimeDimension and DataAttributes not depending on the MeasureDimension (these components by definition have always the same values for all the observations of the set above) become the values of the corresponding VTL (simple) Identifiers, (time) Identifier and Attributes.
269 +* The values of the SDMX simple Dimensions, TimeDimension and DataAttributes not depending on the MeasureDimension (these components by definition have always the same values for all the observations of the set above) become the values of the corresponding VTL (simple)
270 +
271 +Identifiers, (time) Identifier and Attributes.
272 +
259 259  * The value of the Measure of the SDMX observation belonging to the set above and having MeasureDimension=Cj becomes the value of the VTL Measure Cj
260 260  * For the SDMX DataAttributes depending on the MeasureDimension, the value of the DataAttribute DA of the SDMX observation belonging to the set above and having MeasureDimension=Cj becomes the value of the VTL Attribute DA_Cj
261 261  
... ... @@ -622,159 +622,204 @@
622 622  
623 623  The following table describes the default mapping for converting from the SDMX data types to the VTL basic scalar types.
624 624  
625 -(% style="width:823.294px" %)
626 -|(% style="width:509px" %)**SDMX data type (BasicComponentDataType)**|(% style="width:312px" %)**Default VTL basic scalar type**
627 -|(% style="width:509px" %)(((
639 +|SDMX data type (BasicComponentDataType)|Default VTL basic scalar type
640 +|(((
628 628  String
642 +
629 629  (string allowing any character)
630 -)))|(% style="width:312px" %)string
631 -|(% style="width:509px" %)(((
644 +)))|string
645 +|(((
632 632  Alpha
647 +
633 633  (string which only allows A-z)
634 -)))|(% style="width:312px" %)string
635 -|(% style="width:509px" %)(((
649 +)))|string
650 +|(((
636 636  AlphaNumeric
652 +
637 637  (string which only allows A-z and 0-9)
638 -)))|(% style="width:312px" %)string
639 -|(% style="width:509px" %)(((
654 +)))|string
655 +|(((
640 640  Numeric
657 +
641 641  (string which only allows 0-9, but is not numeric so that is can having leading zeros)
642 -)))|(% style="width:312px" %)string
643 -|(% style="width:509px" %)(((
659 +)))|string
660 +|(((
644 644  BigInteger
662 +
645 645  (corresponds to XML Schema xs:integer datatype; infinite set of integer values)
646 -)))|(% style="width:312px" %)integer
647 -|(% style="width:509px" %)(((
664 +)))|integer
665 +|(((
648 648  Integer
649 -(corresponds to XML Schema xs:int datatype; between -2147483648 and +2147483647 (inclusive))
650 -)))|(% style="width:312px" %)integer
651 -|(% style="width:509px" %)(((
667 +
668 +(corresponds to XML Schema xs:int datatype; between -2147483648 and +2147483647
669 +
670 +(inclusive))
671 +)))|integer
672 +|(((
652 652  Long
653 -(corresponds to XML Schema xs:long datatype; between -9223372036854775808 and +9223372036854775807 (inclusive))
654 -)))|(% style="width:312px" %)integer
655 -|(% style="width:509px" %)(((
674 +
675 +(corresponds to XML Schema xs:long datatype; between -9223372036854775808 and
676 +
677 ++9223372036854775807 (inclusive))
678 +)))|integer
679 +|(((
656 656  Short
681 +
657 657  (corresponds to XML Schema xs:short datatype; between -32768 and -32767 (inclusive))
658 -)))|(% style="width:312px" %)integer
659 -|(% style="width:509px" %)Decimal (corresponds to XML Schema xs:decimal datatype; subset of real numbers that can be represented as decimals)|(% style="width:312px" %)number
660 -|(% style="width:509px" %)(((
683 +)))|integer
684 +|Decimal (corresponds to XML Schema xs:decimal datatype; subset of real numbers that can be represented as decimals)|number
685 +|(((
661 661  Float
687 +
662 662  (corresponds to XML Schema xs:float datatype; patterned after the IEEE single-precision 32-bit floating point type)
663 -)))|(% style="width:312px" %)number
664 -|(% style="width:509px" %)(((
689 +)))|number
690 +|(((
665 665  Double
692 +
666 666  (corresponds to XML Schema xs:double datatype; patterned after the IEEE double-precision 64-bit floating point type)
667 -)))|(% style="width:312px" %)number
668 -|(% style="width:509px" %)(((
694 +)))|number
695 +|(((
669 669  Boolean
670 -(corresponds to the XML Schema xs:boolean datatype; support the mathematical concept of binary-valued logic: {true, false})
671 -)))|(% style="width:312px" %)boolean
672 672  
673 -(% style="width:822.294px" %)
674 -|(% colspan="2" style="width:507px" %)(((
698 +(corresponds to the XML Schema xs:boolean datatype; support the mathematical concept of
699 +
700 +binary-valued logic: {true, false})
701 +)))|boolean
702 +
703 +| |(% colspan="2" %)(((
675 675  URI
705 +
676 676  (corresponds to the XML Schema xs:anyURI; absolute or relative Uniform Resource Identifier Reference)
677 -)))|(% colspan="1" style="width:311px" %)string
678 -|(% colspan="2" style="width:507px" %)(((
707 +)))|(% colspan="2" %)string
708 +| |(% colspan="2" %)(((
679 679  Count
710 +
680 680  (an integer following a sequential pattern, increasing by 1 for each occurrence)
681 -)))|(% colspan="1" style="width:311px" %)integer
682 -|(% colspan="2" style="width:507px" %)(((
712 +)))|(% colspan="2" %)integer
713 +| |(% colspan="2" %)(((
683 683  InclusiveValueRange
715 +
684 684  (decimal number within a closed interval, whose bounds are specified in the SDMX representation by the facets minValue and maxValue)
685 -)))|(% colspan="1" style="width:311px" %)number
686 -|(% colspan="2" style="width:507px" %)(((
717 +)))|(% colspan="2" %)number
718 +| |(% colspan="2" %)(((
687 687  ExclusiveValueRange
720 +
688 688  (decimal number within an open interval, whose bounds are specified in the SDMX representation by the facets minValue and maxValue)
689 -)))|(% colspan="1" style="width:311px" %)number
690 -|(% colspan="2" style="width:507px" %)(((
722 +)))|(% colspan="2" %)number
723 +| |(% colspan="2" %)(((
691 691  Incremental
725 +
692 692  (decimal number the increased by a specific interval (defined by the interval facet), which is typically enforced outside of the XML validation)
693 -)))|(% colspan="1" style="width:311px" %)number
694 -|(% colspan="2" style="width:507px" %)(((
727 +)))|(% colspan="2" %)number
728 +| |(% colspan="2" %)(((
695 695  ObservationalTimePeriod
730 +
696 696  (superset of StandardTimePeriod and TimeRange)
697 -)))|(% colspan="1" style="width:311px" %)time
698 -|(% colspan="2" style="width:507px" %)(((
732 +)))|(% colspan="2" %)time
733 +| |(% colspan="2" %)(((
699 699  StandardTimePeriod
700 -(superset of BasicTimePeriod and ReportingTimePeriod)
701 -)))|(% colspan="1" style="width:311px" %)time
702 -|(% colspan="2" style="width:507px" %)(((
735 +
736 +(superset of BasicTimePeriod and
737 +
738 +ReportingTimePeriod)
739 +)))|(% colspan="2" %)time
740 +| |(% colspan="2" %)(((
703 703  BasicTimePeriod
742 +
704 704  (superset of GregorianTimePeriod and DateTime)
705 -)))|(% colspan="1" style="width:311px" %)date
706 -|(% colspan="2" style="width:507px" %)(((
744 +)))|(% colspan="2" %)date
745 +| |(% colspan="2" %)(((
707 707  GregorianTimePeriod
747 +
708 708  (superset of GregorianYear, GregorianYearMonth, and GregorianDay)
709 -)))|(% colspan="1" style="width:311px" %)date
710 -|(% colspan="2" style="width:507px" %)GregorianYear (YYYY)|(% colspan="1" style="width:311px" %)date
711 -|(% colspan="2" style="width:507px" %)GregorianYearMonth / GregorianMonth (YYYY-MM)|(% colspan="1" style="width:311px" %)date
712 -|(% colspan="2" style="width:507px" %)GregorianDay (YYYY-MM-DD)|(% colspan="1" style="width:311px" %)date
713 -|(% colspan="2" style="width:507px" %)(((
749 +)))|(% colspan="2" %)date
750 +| |(% colspan="2" %)GregorianYear (YYYY)|(% colspan="2" %)date
751 +| |(% colspan="2" %)GregorianYearMonth / GregorianMonth (YYYY-MM)|(% colspan="2" %)date
752 +| |(% colspan="2" %)GregorianDay (YYYY-MM-DD)|(% colspan="2" %)date
753 +| |(% colspan="2" %)(((
714 714  ReportingTimePeriod
715 -(superset of RepostingYear, ReportingSemester, ReportingTrimester, ReportingQuarter, ReportingMonth, ReportingWeek, ReportingDay)
716 -)))|(% colspan="1" style="width:311px" %)time_period
717 -|(% colspan="2" style="width:507px" %)(((
755 +
756 +(superset of RepostingYear, ReportingSemester,
757 +
758 +ReportingTrimester, ReportingQuarter,
759 +
760 +ReportingMonth, ReportingWeek, ReportingDay)
761 +)))|(% colspan="2" %)time_period
762 +| |(% colspan="2" %)(((
718 718  ReportingYear
764 +
719 719  (YYYY-A1 – 1 year period)
720 -)))|(% colspan="1" style="width:311px" %)time_period
721 -|(% colspan="2" style="width:507px" %)(((
766 +)))|(% colspan="2" %)time_period
767 +| |(% colspan="2" %)(((
722 722  ReportingSemester
769 +
723 723  (YYYY-Ss – 6 month period)
724 -)))|(% colspan="1" style="width:311px" %)time_period
725 -|(% colspan="2" style="width:507px" %)(((
771 +)))|(% colspan="2" %)time_period
772 +| |(% colspan="2" %)(((
726 726  ReportingTrimester
774 +
727 727  (YYYY-Tt – 4 month period)
728 -)))|(% colspan="1" style="width:311px" %)time_period
729 -|(% colspan="2" style="width:507px" %)(((
776 +)))|(% colspan="2" %)time_period
777 +| |(% colspan="2" %)(((
730 730  ReportingQuarter
779 +
731 731  (YYYY-Qq – 3 month period)
732 -)))|(% colspan="1" style="width:311px" %)time_period
733 -|(% colspan="2" style="width:507px" %)(((
781 +)))|(% colspan="2" %)time_period
782 +| |(% colspan="2" %)(((
734 734  ReportingMonth
784 +
735 735  (YYYY-Mmm – 1 month period)
736 -)))|(% colspan="1" style="width:311px" %)time_period
737 -|(% colspan="2" style="width:507px" %)ReportingWeek|(% colspan="1" style="width:311px" %)time_period
738 -|(% colspan="1" style="width:507px" %)(YYYY-Www – 7 day period; following ISO 8601 definition of a week in a year)|(% colspan="2" style="width:312px" %)
739 -|(% colspan="1" style="width:507px" %)(((
786 +)))|(% colspan="2" %)time_period
787 +| |(% colspan="2" %)ReportingWeek|(% colspan="2" %)time_period
788 +| |(% colspan="2" %) |(% colspan="2" %)
789 +| |(% colspan="2" %) |(% colspan="2" %)
790 +|(% colspan="2" %)(YYYY-Www – 7 day period; following ISO 8601 definition of a week in a year)|(% colspan="2" %) |
791 +|(% colspan="2" %)(((
740 740  ReportingDay
793 +
741 741  (YYYY-Dddd – 1 day period)
742 -)))|(% colspan="2" style="width:312px" %)time_period
743 -|(% colspan="1" style="width:507px" %)(((
795 +)))|(% colspan="2" %)time_period|
796 +|(% colspan="2" %)(((
744 744  DateTime
798 +
745 745  (YYYY-MM-DDThh:mm:ss)
746 -)))|(% colspan="2" style="width:312px" %)date
747 -|(% colspan="1" style="width:507px" %)(((
800 +)))|(% colspan="2" %)date|
801 +|(% colspan="2" %)(((
748 748  TimeRange
803 +
749 749  (YYYY-MM-DD(Thh:mm:ss)?/<duration>)
750 -)))|(% colspan="2" style="width:312px" %)time
751 -|(% colspan="1" style="width:507px" %)(((
805 +)))|(% colspan="2" %)time|
806 +|(% colspan="2" %)(((
752 752  Month
808 +
753 753  (~-~-MM; speicifies a month independent of a year; e.g. February is black history month in the United States)
754 -)))|(% colspan="2" style="width:312px" %)string
755 -|(% colspan="1" style="width:507px" %)(((
810 +)))|(% colspan="2" %)string|
811 +|(% colspan="2" %)(((
756 756  MonthDay
813 +
757 757  (~-~-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)
758 -)))|(% colspan="2" style="width:312px" %)string
759 -|(% colspan="1" style="width:507px" %)(((
815 +)))|(% colspan="2" %)string|
816 +|(% colspan="2" %)(((
760 760  Day
818 +
761 761  (~-~--DD; specifies a day independent of a month or year; e.g. the 15^^th^^ is payday)
762 -)))|(% colspan="2" style="width:312px" %)string
763 -|(% colspan="1" style="width:507px" %)(((
820 +)))|(% colspan="2" %)string|
821 +|(% colspan="2" %)(((
764 764  Time
823 +
765 765  (hh:mm:ss; time independent of a date; e.g. coffee break is at 10:00 AM)
766 -)))|(% colspan="2" style="width:312px" %)string
767 -|(% colspan="1" style="width:507px" %)(((
825 +)))|(% colspan="2" %)string|
826 +|(% colspan="2" %)(((
768 768  Duration
828 +
769 769  (corresponds to XML Schema xs:duration datatype)
770 -)))|(% colspan="2" style="width:312px" %)duration
771 -|(% colspan="1" style="width:507px" %)XHTML|(% colspan="2" style="width:312px" %)Metadata type – not applicable
772 -|(% colspan="1" style="width:507px" %)KeyValues|(% colspan="2" style="width:312px" %)Metadata type – not applicable
773 -|(% colspan="1" style="width:507px" %)IdentifiableReference|(% colspan="2" style="width:312px" %)Metadata type – not applicable
774 -|(% colspan="1" style="width:507px" %)DataSetReference|(% colspan="2" style="width:312px" %)Metadata type – not applicable
830 +)))|(% colspan="2" %)duration|
831 +|(% colspan="2" %)XHTML|(% colspan="2" %)Metadata type – not applicable|
832 +|(% colspan="2" %)KeyValues|(% colspan="2" %)Metadata type – not applicable|
833 +|(% colspan="2" %)IdentifiableReference|(% colspan="2" %)Metadata type – not applicable|
834 +|(% colspan="2" %)DataSetReference|(% colspan="2" %)Metadata type – not applicable|
775 775  
776 -(% class="wikigeneratedid" id="HFigure142013MappingsfromSDMXdatatypestoVTLBasicScalarTypes" %)
777 -**Figure 14 – Mappings from SDMX data types to VTL Basic Scalar Types**
836 +==== Figure 14 – Mappings from SDMX data types to VTL Basic Scalar Types ====
778 778  
779 779  When VTL takes in input SDMX artefacts, it is assumed that a type conversion according to the table above always happens. In case a different VTL basic scalar type is desired, it can be achieved in the VTL program taking in input the default VTL basic scalar type above and applying to it the VTL type conversion features (see the implicit and explicit type conversion and the "cast" operator in the VTL Reference Manual).
780 780  
... ... @@ -782,32 +782,39 @@
782 782  
783 783  The following table describes the default conversion from the VTL basic scalar types to the SDMX data types .
784 784  
785 -(% style="width:1073.29px" %)
786 -|(% style="width:207px" %)(((
787 -**VTL basic scalar type**
788 -)))|(% style="width:462px" %)(((
789 -**Default SDMX data type (BasicComponentDataType)**
790 -)))|(% style="width:402px" %)**Default output format**
791 -|(% style="width:207px" %)String|(% style="width:462px" %)String|(% style="width:402px" %)Like XML (xs:string)
792 -|(% style="width:207px" %)Number|(% style="width:462px" %)Float|(% style="width:402px" %)Like XML (xs:float)
793 -|(% style="width:207px" %)Integer|(% style="width:462px" %)Integer|(% style="width:402px" %)Like XML (xs:int)
794 -|(% style="width:207px" %)Date|(% style="width:462px" %)DateTime|(% style="width:402px" %)YYYY-MM-DDT00:00:00Z
795 -|(% style="width:207px" %)Time|(% style="width:462px" %)StandardTimePeriod|(% style="width:402px" %)<date>/<date> (as defined above)
796 -|(% style="width:207px" %)time_period|(% style="width:462px" %)(((
844 +|(((
845 +VTL basic
846 +
847 +scalar type
848 +)))|(((
849 +Default SDMX data type
850 +
851 +(BasicComponentDataType
852 +
853 +)
854 +)))|Default output format
855 +|String|String|Like XML (xs:string)
856 +|Number|Float|Like XML (xs:float)
857 +|Integer|Integer|Like XML (xs:int)
858 +|Date|DateTime|YYYY-MM-DDT00:00:00Z
859 +|Time|StandardTimePeriod|<date>/<date> (as defined above)
860 +|time_period|(((
797 797  ReportingTimePeriod
862 +
798 798  (StandardReportingPeriod)
799 -)))|(% style="width:402px" %)(((
864 +)))|(((
800 800  YYYY-Pppp
866 +
801 801  (according to SDMX )
802 802  )))
803 -|(% style="width:207px" %)Duration|(% style="width:462px" %)Duration|(% style="width:402px" %)(((
869 +|Duration|Duration|(((
804 804  Like XML (xs:duration)
871 +
805 805  PnYnMnDTnHnMnS
806 806  )))
807 -|(% style="width:207px" %)Boolean|(% style="width:462px" %)Boolean|(% style="width:402px" %)Like XML (xs:boolean) with the values "true" or "false"
874 +|Boolean|Boolean|Like XML (xs:boolean) with the values "true" or "false"
808 808  
809 -(% class="wikigeneratedid" id="HFigure142013MappingsfromSDMXdatatypestoVTLBasicScalarTypes-1" %)
810 -**Figure 14 – Mappings from SDMX data types to VTL Basic Scalar Types**
876 +==== Figure 14 – Mappings from SDMX data types to VTL Basic Scalar Types ====
811 811  
812 812  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).
813 813  
... ... @@ -861,7 +861,7 @@
861 861  |N|fixed number of digits used in the preceding textual representation of the month or the day
862 862  | |
863 863  
864 -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}}.
930 +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^^[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)^^42^^>>path:#sdfootnote42sym||name="sdfootnote42anc"]](%%)^^.
865 865  
866 866  === 12.4.5 Null Values ===
867 867  
... ... @@ -879,8 +879,10 @@
879 879  
880 880  A different format can be specified in the attribute "vtlLiteralFormat" of the CustomType artefact (see also the section Transformations and Expressions of the SDMX information model).
881 881  
882 -Like in the case of the conversion of NULLs described in the previous paragraph, the overriding assumption is applied, for a certain VTL basic scalar type, if a value is found for the vtlLiteralFormat attribute of the CustomType of such VTL basic scalar type. The overriding assumption is applied for all the literals of a related VTL TransformationScheme.
948 +Like in the case of the conversion of NULLs described in the previous paragraph, the overriding assumption is applied, for a certain VTL basic scalar type, if a value is found for the vtlLiteralFormat attribute of the CustomType of such VTL basic scalar type. The overriding assumption is applied for all the literals of a related VTL
883 883  
950 +TransformationScheme.
951 +
884 884  In case a literal is operand of a VTL Cast operation, the format specified in the Cast overrides all the possible otherwise specified formats.
885 885  
886 886  {{putFootnotes/}}