class documentation
        
        class SectionSubTitle(TitlePromoter): (source)
Constructor: SectionSubTitle(document, startnode)
This works like document subtitles, but for sections. For example,
<section>
    <title>
        Title
    <section>
        <title>
            Subtitle
        ...
is transformed into
<section>
    <title>
        Title
    <subtitle>
        Subtitle
    ...
For details refer to the docstring of DocTitle.
| Method | apply | 
    Override to apply the transform to the document tree. | 
| Class Variable | default | 
    Numerical priority of this transform, 0 through 999 (override). | 
              Inherited from TitlePromoter:
            
| Method | candidate | 
    Find and return the promotion candidate and its index. | 
| Method | promote | 
    Transform the following node tree: | 
| Method | promote | 
    Transform the following tree: | 
              Inherited from Transform (via TitlePromoter):
            
| Method | __init__ | 
    Initial setup for in-place document transforms. | 
| Instance Variable | document | 
    The document tree to transform. | 
| Instance Variable | language | 
    Language module local to this document. | 
| Instance Variable | startnode | 
    Node from which to begin the transform.  For many transforms which apply to the document as a whole, startnode is not set (i.e. its value is None). |