FutureMetadata Class

Future Metadata.When the object is serialized out as xml, its qualified name is x:futureMetadata.

Inheritance Hierarchy


Namespace:  DocumentFormat.OpenXml.Spreadsheet
Assembly:  DocumentFormat.OpenXml (in DocumentFormat.OpenXml.dll)


<ChildElementInfoAttribute(GetType(ExtensionList))> _
<ChildElementInfoAttribute(GetType(FutureMetadataBlock))> _
Public Class FutureMetadata _
    Inherits OpenXmlCompositeElement
Dim instance As FutureMetadata
public class FutureMetadata : OpenXmlCompositeElement


The following table lists the possible child types:

  • FutureMetadataBlock <x:bk>

  • ExtensionList <x:extLst>

[ISO/IEC 29500-1 1st Edition]

18.9.4 futureMetadata (Future Metadata)

This element represents future metadata information.

Future data storage areas are xml storage areas that a later version of the spreadsheet application can store data into. So a V2 spreadsheet application can store data for new features that don't exist in the V1 version in a future storage area when saving to a format that the V1 version can open. The V1 version might be able to open the file, but won't necessarily be able to understand data that is stored in a future storage area. So the V1 version might ignore this data, but still round trip it in the file format so that V2 and V1 users can collaborate on the same spreadsheet.

Parent Elements

metadata (§18.9.8)

Child Elements


bk (Future Metadata Block)


extLst (Future Feature Data Storage Area)




count (Future Metadata Block Count)

Number of future metadata blocks.

The possible values for this attribute are defined by the W3C XML Schema unsignedInt datatype.

name (Metadata Type Name)

Metadata type name.

The possible values for this attribute are defined by the ST_Xstring simple type (§

[Note: The W3C XML Schema definition of this element’s content model (CT_FutureMetadata) is located in §A.2. end note]

© ISO/IEC29500: 2008.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

See Also


FutureMetadata Members

DocumentFormat.OpenXml.Spreadsheet Namespace