def __build_lxml(target, source, env):
    """
    General XSLT builder (HTML/FO), using the lxml module.
    """
    from lxml import etree
    
    xslt_ac = etree.XSLTAccessControl(read_file=True, 
                                      write_file=True, 
                                      create_dir=True, 
                                      read_network=False, 
                                      write_network=False)
    xsl_style = env.subst('$DOCBOOK_XSL')
    xsl_tree = etree.parse(xsl_style)
    transform = etree.XSLT(xsl_tree, access_control=xslt_ac)
    doc = etree.parse(str(source[0]))
    # Support for additional parameters
    parampass = {}
    if parampass:
        result = transform(doc, **parampass)
    else:
        result = transform(doc)
        
    try:
        of = open(str(target[0]), "wb")
        of.write(of.write(etree.tostring(result, pretty_print=True)))
        of.close()
    except:
        pass

    return None
General XSLT builder (HTML/FO), using the lxml module.