Notice that the snum and secnum attributes are automatically populated from the Word content (i.e., the heading number I and the section number 2.1).
eXtyles will populate the snum and secnum values so long as they are present in the Word document. If a heading in the Word document is not numbered, the snum attribute in the XML will be empty (same for the section number/secnum).
This behavior is the same for all styles Heading 1 through 6. For example,
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