Special unicode characters like '≤' displayed not displayed correctly

Hi Aspose-Team,

i'm facing a problem with special unicode characters like '≤'. Here are my code snippets:

XML:
<?xml version="1.0" encoding="utf-16"?>
<AnyDocModel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"/>

XSLT:
<?xml version="1.0" encoding="utf-8" ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template name="Main" match="node()">
    <Pdf xmlns="Aspose.Pdf">
      <Section>               
        <Text><Segment>korrekt ®</Segment></Text>
        <Text><Segment>not korrekt ≤</Segment></Text>
      </Section>
    </Pdf>
  </xsl:template>
</xsl:stylesheet>

Binding snippet is pretty common:
Pdf pdf = new Pdf();
pdf.BindXML(xml, xslt);
byte[] pdfFile;
 using (MemoryStream memStream = new MemoryStream())
{
    pdf.Save(memStream);
    memStream.Position = 0;
    pdfFile = memStream.ToArray();
}
return pdfFile;

I got  character '≤' displayed like 'd' what is absolutely wrong. All charecters (see under http://en.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references) of type HTMLsymbol ('≤', '≠' an so on) or HTMLspecial are always wrong. Characters of type HTMLlat1 ('®', '«') are displayed korrektly.
What am i doing whrong? Do i need configure something or preload somehow whole character table?

Best regard
Alex