[xsl] ## in text

I'm using xalan with java.

I have a strange problem: any ## in text seems cut of all the input till the
end of line.

Why?

Peiyun
----------------
<para>La connaissance et la comprihension ## des micanismes
<sup>##</sup>affectant ...</para>
<para>Par ailleurs, il ...</para>

Will only output:
<p>La connaissance et la comprihension
<p>Par ailleurs, il ...</p>