File Content Extraction 26.2
Filter SDK Python Programming Guide

# Process Subfiles

To filter all files in a container file, you can open the container as a Document object, then open its subfiles as Document objects. After you open a subfile as a Document, you can call its methods to filter the data.

You can iterate over subfile objects by calling the `subfiles` method on a document. Each element returned by the iterator contains information about the subfile, and a method to open it as a document.

In the following example, we open each subfile as a document, and filter some text from it.

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    for subfile in doc.subfiles:
        with subfile.open() as (child, extract_info):
            if child:
                child.filter(sys.stdout)

## Extract Subfiles

In some cases, you might need to access the subfiles directly, for example to archive the subfiles or process them using a different tool. In this case, you can open the container as a Document object, then open its subfiles as Document objects. After you open a subfile as a Document, you can call its methods to filter the data.

NOTE: Some options change the order in which subfiles are retrieved, such as enabling the root node. However, for each combination of options, the subfile order is consistent across multiple runs.

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Version 26.2 | Last updated April 2026

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Product: File Content Extraction 26.2

Topic Title: Process Subfiles