You can import data from external database using Layout wizard and then clicking XML mode. You will see the dialog box like this below:

Fig 1. Layout Wizard - XML options

In this step you define the source of XML data ('XML layout file' option), which can be a local/network path or URL. The XML document should conform to the following DTD (document type definition):

<!DOCTYPE sitemap [
  <!ELEMENT sitemap (node+)>
  <!ELEMENT node (node*|text)*>
  <!ATTLIST node
    href CDATA #IMPLIED
    icon CDATA #IMPLIED
    icon2 CDATA #IMPLIED
    icon2pos (left|right) "right">
  <!ELEMENT text (#PCDATA)>
]>

Here's a sample XML file that can be used:

<sitemap> 
  <node> 
    <text>Images</text> 
    <node href="Cars/"> 
      <text>Cars</text> 
      <node href="Cars/BMW.htm" icon="c:\icons\caricon.gif" icon2="1"> 
        <text>BMW</text> 
      </node> 
      <node href="Cars/Porsche.htm" icon2="c:\icons\caricon2.gif" icon2pos="left"> 
        <text>Porsche</text> 
      </node> 
    </node> 
    <node> 
      <text>Nature</text> 
      <node href="animals/" icon2="4" icon2pos="right"> 
        <text>animals</text> 
      </node> 
      <node href="forests/"> 
        <text>forests</text> 
      </node> 
      <node href="mountains/" icon2="c:\icons\c.gif"> 
        <text>mountains</text> 
      </node> 
    </node> 
  </node> 
</sitemap>