pre-formatted text in FO terminology

How can I express the fact that a <fo:block> area
contains pre-formatted text (that does not have to
be formatted, but output honoring the line-breaks,
multiple spaces, etc.)? In other words,how would I write
the equivalent of a <PRE>...</PRE> element using,
presumably an fo:block with a set of attributes, thus:
<fo:block which-attributes-here??...> 

my preformatted text

</fo:block>
PS. The same is needed for, e.g., the programlisting
    element type in DocBook.
----------------------------------------------------
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