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2.1 File Structure

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This section specifies the overall structure of a file that conforms to this specification.

A file of the type specified by this document is a package (section 2.1.1) that contains a collection of related parts (section 2.1.2). Parts contain information about the contents of a workbook, including workbook data and the structure of the package. Some parts contain information stored using binary records (section 2.1.4), some parts contain information stored using XML, and other parts contain information stored as a binary stream of bytes. Each binary record contains zero or more structured fields that contain the workbook data.