Closing and reopening hierarchically structured elements

Hi,

I am facing a problem which I don't know how to tackle.
I am currently doing an XML to FO transformation. 
The produced FO documents have two columns.
My problem now is, that I want my tables to span 
over all two columns.
I think that I can only achieve that using a two-step approach.

1. Create a basic fo structure
2. Rearrange table markup

The second step involves closing all ancestor elements before my table.
Generating an <fo:block span="all">, including my table markup within
and re-opening my closed ancestor elements (including all attributes
defined before).


structure after 1:

<fo:flow>
        <fo:block ... >
                <fo:block ...>
                        <fo:inline>
                                <table>
                                        ...
                                </table>
                        </fo:inline>
                        ...
                </fo:block>
        </fo:block>
</fo:flow>


structure after 2:

<fo:flow>
        <fo:block ... >
                <fo:block ...>
                        <fo:inline/>
                </fo:block>
        </fo:block>
        <fo:block span="all"">
                <table>
                        ...
                </table>
        </fo:block>
        <fo:block ... >
                <fo:block ...>
                        <fo:inline>
                        ...



Since I don't know on which hierarchical level my tables appear I would
need some kind of 
generic algorythm to close an re-open my ancestors.

Can you give me some hint, how to achieve this? 
Is there any way to do this during my first XML => FO transformation?

wbr,
Roman

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