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2.2.7.4 External Link

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An external link is a type of supporting link (section 2.2.7.2) that references a data source outside the current workbook. The BrtSupBookSrc (section 2.4.800) record that specifies an external link that contains a relationship to an External Links (section 2.1.7.25) part that will contain further information about this external link. There are three types of external links. The type is specified by the sbt field in the BrtBeginSupBook (section 2.4.234) record in the External Links part. These three types of external links are specified by the sequence of records that conform to the EXTERNALBOOK rule (as defined in section 2.1.7.25) or by the sequence of records that conform to the DDEOLELINK rule (as defined in section 2.1.7.25) in the External Links part ABNF, and are defined in the following table.

External link type

Record sequence ABNF

External Workbook (section 2.1.10)

EXTERNALBOOK

DDE Data Source (section 2.2.7.4.2)

DDEOLELINK

OLE Data Source (section 2.2.7.4.3)

DDEOLELINK