xslt - value of select ignore one type of child -

i've below xml

<p>         <b>chapter 3: industrial drawings</b>         <fn>           <fnn>11</fnn>           <fnt>             <p>fnt 1</p>           </fnt>         </fn>         <b>and designs</b>       </p> 

and i'm using below line, i'm getting data in p

<xsl:template match ="p"> <xsl:value-of select="descendant-or-self::*/text() except descendant::fn"/> </xsl:template> 

here i'm trying content of p , ignore fn node(). output

chapter 3: industrial drawings11fnt 1and designs 

but expected

chapter 3: industrial drawings , designs 

here i'm using descendant-or-self::*/text() because there might many cases below.

p/b/text() p/b/c/text() p/i/c/text() etc... 

i want ignore fn , print text(). please let me know how can this.

the except operator set difference, x except y gives nodes in set x , not in set y. in case "x" set of text nodes , "y" set of element nodes, won't exclude anything. if wanted descendant text nodes except inside fn say

<xsl:value-of select=".//text()[not(ancestor::fn)]"/>