ExtensionList Class

Defines the ExtensionList Class.When the object is serialized out as xml, its qualified name is x:extLst.

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

public class ExtensionList : OpenXmlCompositeElement

The following table lists the possible child types:

  • Extension <x:ext>

[ISO/IEC 29500-1 1st Edition]

18.2.10 extLst (Future Feature Data Storage Area)

This element provides a convention for extending spreadsheetML in defined locations within the markup specification. The locations shall be denoted with the extLst element, and are called extension lists. Extension list locations within the markup document are specified in the markup specification and can be used to store extensions to the markup specification, whether those are future version extensions of the markup specification or are private extensions implemented independently from the markup specification. Markup within an extension might not be understood by a markup consumer.

extLst elements contain ext elements, called extensions. See §18.2.7 for more discussion of extensions.

[Note: Allowing markup specification extensions and private markup extensions within an extension list does not violate interoperability because the rules articulated within §18.2.7 and Part 5, §12 describe how markup producers and consumers must generate and consume markup documents containing application defined extension elements, including how to avoid and when to generate error conditions. end note]

[Note: This element is not intended to reintroduce transitional schema into the strict conformance class. end note]

Parent Elements

autoFilter (§; bk (§18.9.2); c (§; cacheField (§; cacheHierarchy (§; cacheSource (§; calcChain (§18.6.2); calculatedItem (§; calculatedMember (§; cellStyle (§18.8.7); cfRule (§; cfvo (§; chartsheet (§; comments (§18.7.6); conditionalFormat (§; conditionalFormatting (§; connection (§18.13.1); customSheetView (§; customWorkbookView (§18.2.3); dataField (§; dialogsheet (§; dxf (§18.8.14); externalLink (§18.14.8); filter (§; filterColumn (§; format (§; futureMetadata (§18.9.4); groupLevel (§; header (§; ignoredErrors (§; metadata (§18.9.8); nc (§; ndxf (§; oc (§; odxf (§; pageField (§; pivotArea (§; pivotCacheDefinition (§; pivotCacheRecords (§; pivotField (§; pivotHierarchy (§; pivotTableDefinition (§; queryTable (§18.12.2); queryTableField (§18.12.4); queryTableRefresh (§18.12.6); rcc (§; rdn (§; reference (§; rfmt (§; row (§; rsnm (§; sheetView (§; sheetView (§; sheetViews (§; sheetViews (§; singleXmlCell (§; sortState (§; sst (§18.4.9); styleSheet (§18.8.39); table (§; tableColumn (§; tupleCache (§; userInfo (§; volTypes (§18.15.6); workbook (§18.2.27); workbookView (§18.2.30); worksheet (§; xf (§18.8.45); xmlCellPr (§; xmlColumnPr (§; xmlPr (§

Child Elements


ext (Extension)


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

© ISO/IEC29500: 2008.

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