'Serialize the text attribute and its children.
@param write: C{callable}, taking one C{str} argument, called to output
a single text attribute at a time.
@param attrs: A formatting state instance used to determine how to
serialize the attribute children.
@type attributeRenderer: C{str}
@param attributeRenderer: Name of the method on I{attrs} that should be
called to render the attributes during serialization. Defaults to
C{\'toVT102\'}.'

def serialize(self, write, attrs=None, attributeRenderer='toVT102'):

    if (attrs is None):
        attrs = DefaultFormattingState()
    for ch in self.children:
        if isinstance(ch, _Attribute):
            ch.serialize(write, attrs.copy(), attributeRenderer)
        else:
            renderMeth = getattr(attrs, attributeRenderer)
            write(renderMeth())
            write(ch)
