xml - xsl:fo SVG reference -

i searching guide(reference) use svg in xsl:fo because want draw checkboxes. don't know attributes can use.

i using xslt 2.0 , oxygen.

my xsl:fo code checkbox:

<fo:instream-foreign-object>      <svg:svg width="5" height="5" xmlns:svg="http://www.w3.org/2000/svg">         <svg:rect width="5" height="5"  style="stroke-width:5;  stroke:rgb(250,0,0)"/>         <svg:line/>     </svg:svg>  </fo:instream-foreign-object> 

not sure requirements are, might need ballot character, following (or ☑ in xml):

☑

see http://en.wikipedia.org/wiki/check_mark alternatives.