How do I style an embedded in the text from the XML input?

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I have the following XML (just a snippet, but should be enough).  There is 
exactly one <xsl-template> matching the root. Everything is taken from there. A 
document can contain many sections and a section can contain many textblocks.

Note: in the example given the section/textblocks/textblock/text contains 
<strong>...</strong>

<sections>
        <section>
                <sectionTitle>
                        Contract Validity
                </sectionTitle>
                        
                <textBlocks>
                                
                        <textblock>
                                <text>This contract is valid for a period of 
<strong>18 months</strong> and the .... be 7,400.00.</text>
                        </textblock>

                </textBlocks>

                <accepted>false</accepted>
                        
                <acceptanceText>
                        I certify I have ... agree to the above.
                </acceptanceText>
                
        </section>
</sections>

and the respective fragment from the XSL

        <xsl:for-each select="sections/section">
                <fo:block space-after="0.7em" text-decoration="underline">
                        <xsl:value-of select="sectionTitle"/>
                </fo:block>

                <xsl:for-each select="textBlocks/textblock">
                        <fo:block space-after="0.7em">
                                <xsl:value-of select="text"/>
                        </fo:block>
                </xsl:for-each>
        </xsl:for-each>

How can I replace the <strong> by the proper <fo:font-weight=“bold”> tags 
during processing?

I have been reading up on xsl:apply-templates but have only been successful to 
*additionally* show the text “18 months” in bold either before or after the 
selected text, but never replacing the "<strong>18 months</strong>” inline by 
bolded text. However I was able to get rid of the strong-tags so that the text 
in the PDF just read “...period of 18 months and the...” without any visible 
boldness.

Thanks a lot
---markus---