How to apply bold attribute to a string?

Hi,
 
    Can anybody tell me how I can apply a bold attribute to a sting of words in FOP without breaking a statement. I tried using 
 
<fo:block font-family="serif" font-weight="bold"><xsl:apply-templates/></fo:block>

This gives a line break before & after the bold string.
 
I tried using the </fo:inline-sequence> but it pops out a error ,
 
Unsupported element encountered: inline-sequence 

Any ideas how I can do this ?
 
!Thanks