The Microsoft Excel File Format - OpenOffice.org

7.1 Document Integration
7.1.2 Chart Sheet in Workbook Document (BIFF5-BIFF8)
Besides other sheets, a workbook document (➜2.1.3) may contain several chart sheets.
Definition: Chart Substream
Each chart sheet is stored in a Chart Substream. This is a special type of a Sheet Substream (➜2.3.4, ➜4.1.2)
with a BOF record containing the type identifier for a chart.
Records in the Workbook Stream (➜2.3.3) containing a Chart Substream, BIFF5-BIFF8:
● BOF Type = workbook globals (➜5.8)
● EOF ➜5.37
Global workbook records
○○
Other Sheet Substreams (or Chart Substreams)
● BOF Type = chart (➜5.8)
● EOF ➜5.37
Chart records
○○
Other Sheet Substreams (or Chart Substreams)
BIFF2-BIFF4 Chart Streams and BIFF5-BIFF8 Chart Substreams are nearly identical in their internal structure.
7.1.3 Embedded Chart Object (BIFF3-BIFF8)
From BIFF3 on, all types of sheets (including chart sheets) may contain embedded chart objects. The chart is described
by a Chart Substream (➜7.1.2) which is embedded into another Sheet Substream or Worksheet Stream and follows an
OBJ record.
Records in the Worksheet Stream containing a Chart Substream of an embedded chart object, BIFF3-BIFF4:
● BOF Type = sheet, dialogue, chart, macro sheet (➜5.8)
Sheet records
● OBJ Object description for the chart
● BOF Type = chart (➜5.8)
Chart records
● EOF End of the Chart Substream of the chart object (➜5.37)
Sheet records
● EOF End of the Sheet Substream (➜5.37)
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