'|Length| value specifying the relative difference in indentation for
the first line of the paragraph. A positive value causes the first
line to be indented. A negative value produces a hanging indent.
|None| indicates first line indentation is inherited from the style
hierarchy.'

@property
def first_line_indent(self):

    pPr = self._element.pPr
    if (pPr is None):
        return None
    return pPr.first_line_indent
