[OASIS Issue Tracker] (ODATA-557) Allow exponential notation for Edm.Decimal

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

     [ https://issues.oasis-open.org/browse/ODATA-557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Pizzo updated ODATA-557:
--------------------------------

    Proposal: 
Allow exponential notation for Edm.Decimal literals.

Add new symbolic value Scale="floating" for DECFLOAT values. The Precision attribute will specify the number of digits in the mantissa.

Services would only allow scale="Floating" for 4.01 and later versions of metadata, 

For 4.01 JSON payloads, exponential decimals is always assumed and format parameter is not needed or used.

  was:
Allow exponential notation for Edm.Decimal literals.

Add new symbolic value Scale="floating" for DECFLOAT values. The Precision attribute will specify the number of digits in the mantissa.

Services would only allow scale="Floating" for 4.01 and versions of metadata, 

For 4.01 JSON payload, exponential decimals is always assumed and format parameter is not needed.  


> Allow exponential notation for Edm.Decimal
> ------------------------------------------
>
>                 Key: ODATA-557
>                 URL: https://issues.oasis-open.org/browse/ODATA-557
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData ABNF Construction Rules, OData ATOM Format, OData CSDL, OData JSON Format, OData Protocol, OData URL Conventions
>    Affects Versions: V4.0_CSD03
>         Environment: Proposed
>            Reporter: Ralf Handl
>            Assignee: Ralf Handl
>              Labels: AdoptionBlocker
>             Fix For: V4.01_WD01
>
>
> IEEE754 also defines the DECFLOAT data type for high-precision decimal arithmetic. They have 16 or 34 decimal digit mantissas and exponents between -383 and +384 or -6143 and +6144.
> Representing them exactly in current Edm.Decimal would result in at most 34 non-zero digits and several thousand zeroes. This waste can easily be avoided by allowing exponential notation also for Edm.Decimal.



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