[Table of Contents] [docx version]

SpreadsheetML Reference Material - Table of Contents

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 may 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 may 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 may 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



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 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 (§3.18.96).

The following XML Schema fragment defines the contents of this element:

<complexType name="CT_FutureMetadata">


   <element name="bk" type="CT_FutureMetadataBlock" minOccurs="0" maxOccurs="unbounded"/>

   <element name="extLst" minOccurs="0" maxOccurs="1" type="CT_ExtensionList"/>


   <attribute name="name" type="ST_Xstring" use="required"/>

   <attribute name="count" type="xsd:unsignedInt" use="optional" default="0"/>