How to escape special characters in Simple Transformation

Hi Experts,
I have got a problem to get a well formed xml document from the below simple transformation. The content of maktx contains
special characters like & <, which are not allowed in a well formed XML-Document. But the result of the Simple Transformation
contains this charcters even after the transformation as you can the in the result below. Has anyone a hint how to escape the
characters included in the maktx.
The transformation for maktx, should be something like
Before: Material & < TEST
After: Material &amp &lt TEST
Report wihich calls the simple transformation
types:
BEGIN OF t_mat,
   matnr type matnr,
   maktx type maktx,
end of t_mat.
Data:
mat type t_mat,
xml_stream type xstring.
START-OF-SELECTION.
mat-matnr = '4711'.
mat-maktx = 'Material & < Test'.
CALL TRANSFORMATION ztest_st2
        SOURCE mat = mat
        RESULT XML xml_stream.
CALL FUNCTION 'DISPLAY_XML_STRING'
EXPORTING xml_string = xml_stream.
Simple Transformation
<?sap.transform simple?>
<tt:transform xmlns:tt="http://www.sap.com/transformation-templates">
<tt:root name="MAT"/>
<tt:template>
    <Leistungsschild>
        <CHARACT> MATNR </CHARACT>
        <CHARACT_DESCR> Materialnummer </CHARACT_DESCR>
        <VALUE tt:value-ref="MAT.MATNR"/>
        <CHARACT> MAKTX </CHARACT>
        <CHARACT_DESCR> Materialkurztext </CHARACT_DESCR>
        <VALUE tt:value-ref="MAT.MAKTX" />
    </Leistungsschild>
</tt:template>
</tt:transform>
RESULT
<?xml version="1.0" encoding="utf-8" ?>
<Leistungsschild>
<CHARACT>MATNR</CHARACT>
<CHARACT_DESCR>Materialnummer</CHARACT_DESCR>
<VALUE>4711</VALUE>
<CHARACT>MAKTX</CHARACT>
<CHARACT_DESCR>Materialkurztext</CHARACT_DESCR>
<VALUE>Material & < Test</VALUE>   </Leistungsschild>

Hi Sandra,
First of all thaks for your quick answer to my problem.
I see what you mean and get the same result, if I am using data-type string instead of xstring. But the recommendation in the XML-Books of SAP is to use XSTRING to save memory and circumflex problems between Codepages, when writing the XML-Stream to a filesystem.
As you can see in the code abvoe I am using a SAP-FM to display the XML-Stream and this FM works only with XSTRING´s,
that is one reason why I don´t understand that it displays it in the wrong way.
Even the Debugger shows me for the XSTRING the wrong result. Does all that mean that the escaping will not be applyed if you are working with XSTING´s??

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