xsl-fo and loop

[sp]

Hi,
I'm trying to write an xsl-fo document that with fop
translate it in PDF.
It's all right, but I have a question:
There is a manner to indicate to xsl-fo to join together a
block section, so that if there is a page break it decide
to print the block in the new page to avoid to break the
block?

Please help me.