First step is to install the Ultralog plugin for homeseer. You'll find it here:
http://ubb.homeseer.com/6/ubb.x?a=tpc&s=697298074&f=6302952361&m=3632963276
This plugin gives you a full sql storage of your hs-log.
Second step is a php script to read the data from your sql db and create al XL xml file. You get a every minute update of your XL database by using the crontab. It works for me, but I'm sorry to have no time for any support. So, love it or leave it

Here is a example script (I am not a professional coder

<?php
//-----------------------------------------
// Title: kerninger sensoren
// Date: 2004/11/08 15:11
// Author: Heiko Kern
// Copyright: kerninger.net
//
//-----------------------------------------
mysql_connect("192.168.1.99", "user", "password");
mysql_select_db("homeseer");
$result_solar1=mysql_query("select Log_Data from tblLog where Log_Type = 'solarsensor1'");
$result_solar2=mysql_query("select Log_Data from tblLog where Log_Type = 'solarsensor2'");
$result_solar3=mysql_query("select Log_Data from tblLog where Log_Type = 'solarsensor3'");
$result_solarpumpe=mysql_query("select Log_Data from tblLog where Log_Type = 'solarventil'");
$result_vorlauf=mysql_query("select Log_Data from tblLog where Log_Type = 'temp_hzg_vorlauf'");
$result_temp_aussen=mysql_query("select Log_Data from tblLog where Log_Type = 'temp_aussen'");
$result_feuchte_aussen=mysql_query("select Log_Data from tblLog where Log_Type = 'feuchte_aussen'");
$result_luftdruck=mysql_query("select Log_Data from tblLog where Log_Type = 'luftdruck'");
$result_temp_innen=mysql_query("select Log_Data from tblLog where Log_Type = 'temp_innen'");
$result_feuchte_innen=mysql_query("select Log_Data from tblLog where Log_Type = 'feuchte_innen'");
$result_temp_keller=mysql_query("select Log_Data from tblLog where Log_Type = 'temp_keller'");
$result_feuchte_keller=mysql_query("select Log_Data from tblLog where Log_Type = 'feuchte_keller'");
$result_temp_terasse=mysql_query("select Log_Data from tblLog where Log_Type = 'temp_terasse'");
$result_feuchte_terasse=mysql_query("select Log_Data from tblLog where Log_Type = 'feuchte_terasse'");
$result_temp_bad=mysql_query("select Log_Data from tblLog where Log_Type = 'temp_bad'");
$result_feuchte_bad=mysql_query("select Log_Data from tblLog where Log_Type = 'feuchte_bad'");
$result_temp_studio=mysql_query("select Log_Data from tblLog where Log_Type = 'temp_studio'");
$result_feuchte_studio=mysql_query("select Log_Data from tblLog where Log_Type = 'feuchte_studio'");
$result_zeit=mysql_query("select Log_Data from tblLog where Log_Type = 'zeit'");
$result_wind=mysql_query("select Log_Data from tblLog where Log_Type = 'wind'");
$result_windrichtung=mysql_query("select Log_Data from tblLog where Log_Type = 'windrichtung'");
$result_helligkeit=mysql_query("select Log_Data from tblLog where Log_Type = 'helligkeit'");
$zeilen_solar1 = mysql_num_rows($result_solar1);
for ($i=0; $i < $zeilen_solar1; $i++)
{
$ergebnis1=mysql_fetch_row($result_solar1);
}
$zeilen_solar2 = mysql_num_rows($result_solar2);
for ($i=0; $i < $zeilen_solar2; $i++)
{
$ergebnis2=mysql_fetch_row($result_solar2);
}
$zeilen_solar3 = mysql_num_rows($result_solar3);
for ($i=0; $i < $zeilen_solar3; $i++)
{
$ergebnis3=mysql_fetch_row($result_solar3);
}
$zeilen_solarpumpe = mysql_num_rows($result_solarpumpe);
for ($i=0; $i < $zeilen_solarpumpe; $i++)
{
$ergebnis4=mysql_fetch_row($result_solarpumpe);
}
$zeilen_vorlauf = mysql_num_rows($result_vorlauf);
for ($i=0; $i < $zeilen_vorlauf; $i++)
{
$ergebnis5=mysql_fetch_row($result_vorlauf);
}
$zeilen_temp_aussen = mysql_num_rows($result_temp_aussen);
for ($i=0; $i < $zeilen_temp_aussen; $i++)
{
$ergebnis6=mysql_fetch_row($result_temp_aussen);
}
$zeilen_feuchte_aussen = mysql_num_rows($result_feuchte_aussen);
for ($i=0; $i < $zeilen_feuchte_aussen; $i++)
{
$ergebnis7=mysql_fetch_row($result_feuchte_aussen);
}
$zeilen_luftdruck = mysql_num_rows($result_luftdruck);
for ($i=0; $i < $zeilen_luftdruck; $i++)
{
$ergebnis8=mysql_fetch_row($result_luftdruck);
}
$zeilen_temp_innen = mysql_num_rows($result_temp_innen);
for ($i=0; $i < $zeilen_temp_innen; $i++)
{
$ergebnis9=mysql_fetch_row($result_temp_innen);
}
$zeilen_feuchte_innen = mysql_num_rows($result_feuchte_innen);
for ($i=0; $i < $zeilen_feuchte_innen; $i++)
{
$ergebnis10=mysql_fetch_row($result_feuchte_innen);
}
$zeilen_temp_keller = mysql_num_rows($result_temp_keller);
for ($i=0; $i < $zeilen_temp_keller; $i++)
{
$ergebnis11=mysql_fetch_row($result_temp_keller);
}
$zeilen_feuchte_keller = mysql_num_rows($result_feuchte_keller);
for ($i=0; $i < $zeilen_feuchte_keller; $i++)
{
$ergebnis12=mysql_fetch_row($result_feuchte_keller);
}
$zeilen_temp_terasse = mysql_num_rows($result_temp_terasse);
for ($i=0; $i < $zeilen_temp_terasse; $i++)
{
$ergebnis13=mysql_fetch_row($result_temp_terasse);
}
$zeilen_feuchte_terasse = mysql_num_rows($result_feuchte_terasse);
for ($i=0; $i < $zeilen_feuchte_terasse; $i++)
{
$ergebnis14=mysql_fetch_row($result_feuchte_terasse);
}
$zeilen_temp_bad = mysql_num_rows($result_temp_bad);
for ($i=0; $i < $zeilen_temp_bad; $i++)
{
$ergebnis15=mysql_fetch_row($result_temp_bad);
}
$zeilen_feuchte_bad = mysql_num_rows($result_feuchte_bad);
for ($i=0; $i < $zeilen_feuchte_bad; $i++)
{
$ergebnis16=mysql_fetch_row($result_feuchte_bad);
}
$zeilen_temp_studio = mysql_num_rows($result_temp_studio);
for ($i=0; $i < $zeilen_temp_studio; $i++)
{
$ergebnis17=mysql_fetch_row($result_temp_studio);
}
$zeilen_feuchte_studio = mysql_num_rows($result_feuchte_studio);
for ($i=0; $i < $zeilen_feuchte_studio; $i++)
{
$ergebnis18=mysql_fetch_row($result_feuchte_studio);
}
$zeilen_zeit = mysql_num_rows($result_zeit);
for ($i=0; $i < $zeilen_zeit; $i++)
{
$ergebnis19=mysql_fetch_row($result_zeit);
}
$zeilen_wind = mysql_num_rows($result_wind);
for ($i=0; $i < $zeilen_wind; $i++)
{
$ergebnis20=mysql_fetch_row($result_wind);
}
$zeilen_windrichtung = mysql_num_rows($result_windrichtung);
for ($i=0; $i < $zeilen_windrichtung; $i++)
{
$ergebnis21=mysql_fetch_row($result_windrichtung);
}
$zeilen_helligkeit = mysql_num_rows($result_helligkeit);
for ($i=0; $i < $zeilen_helligkeit; $i++)
{
$ergebnis22=mysql_fetch_row($result_helligkeit);
}
$data="$ergebnis1[0];$ergebnis2[0];$ergebnis3[0];$ergebnis4[0];$ergebnis5[0];$ergebnis6[0];$ergebnis7[0];$ergebnis8[0];$ergebnis9[0];$ergebnis10[0];$ergebnis11[0];$ergebnis12[0];$ergebnis13[0];$ergebnis14[0];$ergebnis15[0];$ergebnis16[0];$ergebnis17[0];$ergebnis18[0];$ergebnis19[0];$ergebnis20[0];$ergebnis21[0];$ergebnis22[0]";
$header_xml="<?xml version='1.0' encoding='UTF-8'?>\n";
$handle=fopen("sensors.xml","w");
fwrite($handle,$header_xml);
fwrite($handle,$header_xml2);
fwrite($handle,"<database>\n");
fwrite($handle,"<sortorder>display</sortorder>\n");
fwrite($handle,"<sortable>\n");
fwrite($handle,"<sort>wert</sort>\n");
fwrite($handle,"</sortable>\n");
fwrite($handle,"<item>\n");
fwrite($handle,"<parameter>newitem</parameter>\n");
fwrite($handle,"<display>solarsensor1</display>\n");
fwrite($handle,"<information>\n");
fwrite($handle,"<wert>$ergebnis1[0]</wert>\n");
fwrite($handle,"</information>\n");
fwrite($handle,"</item>\n");
fwrite($handle,"<item>\n");
fwrite($handle,"<parameter>newitem</parameter>\n");
fwrite($handle,"<display>solarsensor2</display>\n");
fwrite($handle,"<information>\n");
fwrite($handle,"<wert>$ergebnis2[0]</wert>\n");
fwrite($handle,"</information>\n");
fwrite($handle,"</item>\n");
fwrite($handle,"<item>\n");
fwrite($handle,"<parameter>newitem</parameter>\n");
fwrite($handle,"<display>solarsensor3</display>\n");
fwrite($handle,"<information>\n");
fwrite($handle,"<wert>$ergebnis3[0]</wert>\n");
fwrite($handle,"</information>\n");
fwrite($handle,"</item>\n");
fwrite($handle,"<item>\n");
fwrite($handle,"<parameter>newitem</parameter>\n");
fwrite($handle,"<display>solarpumpe</display>\n");
fwrite($handle,"<information>\n");
fwrite($handle,"<wert>$ergebnis4[0]</wert>\n");
fwrite($handle,"</information>\n");
fwrite($handle,"</item>\n");
fwrite($handle,"</database>\n");
fclose($handle);
printf("Daten wurden erfolgreich aktualisiert");
?>