keep multiple fo:block `s together

hi all,

i have to place some fo:block ´s on the page, but this fo:block `s do not
have to break between. only if there is enough space on the page the
fo:block `s
can stay there. otherwise i need a page break and the fo:block `s are on the
next page.

is there any method to ask in xsl if there is enough space or to
keep some fo:block `s together ???

thanks for any help!

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