The Microsoft Excel File Format - OpenOffice.org

4 Worksheet/Workbook Stream
• Add-In Functions
If a worksheet uses add-in functions, a special EXTERNALNAME record containing the byte sequence 01 H 3A H will
occur. It is followed by the names of all used add-in functions, each inside of an EXTERNALNAME record.
Example: A document contains the formulas =ISODD(1) and =ISEVEN(1).
The Local Link Table of Sheet1 contains an EXTERNSHEET Document Block with the special EXTERN-
SHEET record for add-in functions:
EXTERNCOUNT Number of EXTERNSHEET records = 1
EXTERNSHEET 1
EXTERNALNAME 1
EXTERNALNAME 2
Name = “” (add-in)
Name = “ISODD”
Name = “ISEVEN”
The add-in function names are represented by tNameXR tokens in the formula, here referring to EXTERN-
SHEET 1 and to the respective EXTERNALNAME record. The token is the first argument of the
EXTERN.CALL function, which invokes the call of the add-in function.
• DDE Links, OLE Links
DDE links and OLE links expect the name of the server application (DDE) or the class name (OLE) and the name of a
source document. These items are encoded in an EXTERNSHEET record. It is followed by EXTERNALNAME records
with additional data of the links. An EXTERNALNAME record contains the item (data source range) or the identifier of
the OLE object data storage. Inside a formula, a DDE link or OLE data link is represented by the token tNameXV
(➜3.9.14). An OLE object link contains a tNameX token in its OBJ record.
Example: A document contains a DDE link and an OLE data link to the range A1:B2 of Sheet1 in the Excel
document “D:\example.xls” and a linked OLE object to the bitmap file “D:\example.bmp”.
The Local Link Table of Sheet1 contains two EXTERNSHEET Document Blocks, one for the DDE link, one for
the OLE data link, and one for the linked OLE object:
EXTERNCOUNT Number of EXTERNSHEET records = 1
EXTERNSHEET 1
EXTERNALNAME 1
EXTERNALNAME 2
EXTERNSHEET 2
EXTERNALNAME 1
EXTERNSHEET 3
EXTERNALNAME 1
Name = “excelD:\[example.xls]Sheet1”
(Server = “excel”; Topic = “D:\[example.xls]Sheet1”)
Type = DDE link, representing the “StdDocumentName”
identifier
Item = “StdDocumentName”
Type = DDE link
Item = “A1:B2”
Name = “Excel.Sheet.5D:\example.xls”
(Server = “Excel.Sheet.5”; Topic = “D:\example.xls”)
Type = OLE link
Item = “!Sheet1!A1:B2”
Name = “PackageD:\example.bmp”
(Class name = “Package”; Document = “D:\example.bmp”)
Type = OLE link
Storage = 00012345 H (storage name = “LNK00012345”)
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