Feldwert aus einer externen XML Datei mit PHP in ein SVG Diagramm übertragen

<?php
$out = '';  
function _PRS($str) {
   return(iconv("UTF-8","ISO-8859-1//TRANSLIT",$str));  
}
try {
   $xref = simplexml_load_file('http://www.pegelonline.wsv.de/svgz/pegelstaende_neu.xml');  
   foreach ($xref->table->gewaesser as $value) {
      if (_PRS($value->name) == 'ELBE') {  
         foreach ($value->item as $items) {
            if (_PRS($items->pegelname) == 'DRESDEN') {  

                               $out .= ""._PRS($items->messwert)."";  

                        

               break;
            }
         }
         break;      
      }
   }
   if ($out == '') {  
     $out = "No Data";  
   }
} catch (Exception $e) {
   $out = "No Data";  
}
echo($out);


?> 

<svg width="650" height="500">  
  <g id="axis" transform="translate(0 500) scale(1 -1)">  
    <line id="axis-y" x1="30" y1="20" x2="30" y2="450" style="fill:none;stroke:rgb(0,0,0);stroke-width:2"/>  
    <line id="axis-x" x1="30" y1="20" x2="460" y2="20" style="fill:none;stroke:rgb(0,0,0);stroke-width:2"/>  
  </g>
  <g id="bars" transform="translate(30 479) scale(1 -430)">  
    <rect x="30" y="0" width="50" height=$out .= ""._PRS($items->messwert).""; style="fill:rgb(255,0,0);stroke:rgb(0,0,0);stroke-width:0"/>  
    <rect x="100" y="0" width="50" height="HIER SOLL DIE 223 EINGEFÜGT WERDEN" style="fill:rgb(0,255,0);stroke:rgb(0,0,0);stroke-width:0"/>  
    <rect x="170" y="0" width="50" height="0.75" style="fill:rgb(255,255,0);stroke:rgb(0,0,0);stroke-width:0"/>  
    <rect x="240" y="0" width="50" height="0.9" style="fill:rgb(0,255,255);stroke:rgb(0,0,0);stroke-width:0"/>  
    <rect x="310" y="0" width="50" height="1" style="fill:rgb(0,0,255);stroke:rgb(0,0,0);stroke-width:0"/>  
  </g>
  <g id="scale" transform="translate(29 60)">  
    <text id="scale1" x="0px" y="320px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">0.25</text>  
    <text id="scale2" x="0px" y="215px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">0.50</text>  
    <text id="scale3" x="0px" y="107.5px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">0.75</text>  
    <text id="scale4" x="0px" y="0px" style="text-anchor:end;fill:rgb(0,0,0);font-size:10;font-family:Arial">1.00</text>  
  </g>
  <g id="key">  
    <rect id="key1" x="430" y="80" width="25" height="15" style="fill:rgb(255,0,0);stroke:rgb(0,0,0);stroke-width:1"/>  
    <rect id="key2" x="430" y="100" width="25" height="15" style="fill:rgb(0,255,0);stroke:rgb(0,0,0);stroke-width:1"/>  
    <rect id="key3" x="430" y="120" width="25" height="15" style="fill:rgb(255,255,0);stroke:rgb(0,0,0);stroke-width:1"/>  
    <rect id="key5" x="430" y="140" width="25" height="15" style="fill:rgb(0,255,255);stroke:rgb(0,0,0);stroke-width:1"/>  
    <rect id="key4" x="430" y="160" width="25" height="15" style="fill:rgb(0,0,255);stroke:rgb(0,0,0);stroke-width:1"/>  
    <text id="key1-text" x="465px" y="92px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">schlüssel1</text>  
    <text id="key2-text" x="465px" y="112px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">schlüssel2</text>  
    <text id="key3-text" x="465px" y="132px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">schlüssel3</text>  
    <text id="key4-text" x="465px" y="152px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">schlüssel4</text>  
    <text id="key5-text" x="465px" y="172px" style="fill:rgb(0,0,0);font-size:18;font-family:Arial">schlüssel5</text>  
  </g>
  <g id="title">  
    <text x="325px" y="20px" style="text-anchor:middle;fill:rgb(0,0,0);font-size:24;font-family:Arial">Überschrift</text>  
  </g>
</svg>