代码说明： Compound Documents, or OLE Structured Storage, provide an ingenious and easy way to effectively create a full file-system within a file. A compound document functions as a 'directory' (or root storage in the lingo) which can contain 'sub-directories' (aka storages) and/or 'files' (aka streams). Compound documents also have the ability to automatically buffer any changes until they are committed or rolled back.

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