Just a small update, if anybody care :)
Currently supported tags
<svg:g>
<xsl:apply-templates select="//jpdl:transition"/>
<xsl:apply-templates select="jpdl:start"/>
<xsl:apply-templates select="jpdl:end"/>
<xsl:apply-templates select="jpdl:state"/>
<xsl:apply-templates select="jpdl:hql"/>
<xsl:apply-templates select="jpdl:decision"/>
<xsl:apply-templates select="jpdl:join"/>
<xsl:apply-templates select="jpdl:fork"/>
</svg:g>
Still a lot of work with transitions. Works fast at least under firefox.
And 2 screenshots: from Eclipse & from Firefox