[Zope] Adding a ZPT when adding product instance

[Lee Harr]

I use something like this to add a DTML Method inside of my folderish
product:

    # Add default interface
    index_html = HTMLFile('dtml/index_html', globals())
    text = index_html.read_raw()
    ob.manage_addDTMLMethod(id='index_html', title='')
    idx = ob.index_html
    idx.manage_edit(text, title='')


the source for the index_html file is in the dtml folder in my product,
and is called index_html.dtml

Is this the correct Zope idiom?
How can I do something similar for ZPT?

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