External Workbooks

Source Relationship:

http://schemas.openxmlformats.org/officeDocument/2006/relationships/externalLinkPath

An external workbook is a SpreadsheetML package whose contents are being referenced by the current SpreadsheetML package. When a package refers to external workbooks, it shall store the location of those workbooks using this relationship.

A package is permitted to contain one or more External Workbook relationships, and those relationships shall be an explicit relationship from the External Workbook References (§12.3.9) part.

example:

<Relationships xmlns="…">
  <Relationship Id="rId1" 
    Type="http://…/externalLinkPath" 
    Target="c:\sourceData.xlsx" TargetMode="External"/>
</Relationships>

A external workbook shall be located external to the package containing the source relationship (expressed syntactically, the @TargetMode attribute of the <Relationship> element shall be External).