Representation

The representation of a Concept or Component defines the set of legal values.

There are two different representation types:

Enumerated	A discrete list of values defined by a Codelist
Non-Enumerated	SDMX data types like 'string', 'integer' or one of the 'date/time' types.

There are several different representations in SDMX-ML, taken from XML Schemas and common programming languages. These are listed below: SDMX-ML Data Type 

• String 
• Big Integer 
• Integer 
• Long 
• Short 
• Decimal 
• Float 
• Double 
• Boolean 
• URI 
• DateTime 
• Time 
• GregorianYear 
• GregorianMonth 
• GregorianDay 
• Day, MonthDay, Month  
• Duration

There are also a number of SDMX-ML data types which do not have correspondences with common programming languages:

SDMX-ML Data Type 

• Alpha (common:AlphaType, string which only allows A-z)
• AlphaNumeric (common:AlphaNumericType, string which only allows A-z and 0-9)
• BasicTimePeriod (common: BasicTimePeriodType, a union of GregorianTimePeriod and DateTime)
• Count (xs:integer, a sequence with an interval of "1")
• ExclusiveValueRange (xs:decimal with the minValue and maxValue facets supplying the bounds)
• GregorianTimePeriod (common:GregorianTimePeriodType, a union of GregorianYear, GregorianMonth, and GregorianDay)
• IdentifiableReference (types for each IdentifiableObject)
• InclusiveValueRange (xs:decimal with the minValue and maxValue facets supplying the bounds)
• Incremental (xs:decimal with a specified interval; the interval is typically enforced outside of the XML validation)
• KeyValues (common:DataKeyType)
• Numeric (common:NumericType, string which only allows 0-9, but is not numeric so that is can having leading zeros)
• ObservationalTimePeriod (common: ObservationalTimePeriodType, a union of StandardTimePeriod and TimeRange).
• ReportingDay (common:ReportingDayType)
• ReportingMonth (common:ReportingMonthType)
• ReportingQuarter (common:ReportingQuarterType)
• ReportingSemester (common:ReportingSemesterType)
• ReportingTimePeriod (common:ReportingTimePeriodType, a union of ReportingYear, ReportingSemester, ReportingTrimester, ReportingQuarter, ReportingMonth, ReportingWeek, and ReportingDay).
• ReportingTrimester (common:ReportingTrimesterType)
• ReportingWeek (common:ReportingWeekType)
• ReportingYear (common:ReportingYearType)
• StandardTimePeriod (common: StandardTimePeriodType, a union of BasicTimePeriod and TimeRange).
• TimeRange (common:TimeRangeType, startDateTime + Duration)
• XHTML (common:StructuredText, allows for multi-lingual text content that has XHTML markup)