Document designer XSL snippets - how to align them in table cells VERTICALLY?

Summary:

Document designer XSL snippets - how to align them in table cells VERTICALLY?

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Many of the table cells I have in my Document Designer contain XSL Snippets that display texts. What should I add to my code in order to have these text vertically aligned at the center of the cell? At the moment they are aligned at the top of the cell.
I cannot just put a margin at the top or at the bottom because the texts may have different lenghts and be on one or more rows.

I have tried to put display-align="center" and baseline-shift="central" in the block but it did not work.