Abap ST deserialization

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Hi there i have read now a lot of things about ST but still i don't grasp certain concept.

I have tho following (simplified) XML and Datastructure:

TYPES: BEGIN OF test,  clsname TYPE string,  source TYPE stringtab,  END OF test.DATA tab TYPE zst_t_test..DATA str TYPE string.str ='<classes>' &&'<class name="zcl_umap_exception_object" isException="false">' &&'<definition>' &&'abc' &&  '</definition>' &&'<publicSection>' &&'class zcl_umap_exception_object definition INHERITING FROM ZCL_UMAP_CLASS_OBJECT.' &&'</publicSection>' &&'<privateSection>' &&'private section.' &&'</privateSection>' &&'</class>' &&'</classes>'.

and what i want to achieve is that everything is put into table source. but somehow that doesn't work. i am using this transformation:

<?sap.transform simple?><tt:transform xmlns:tt="http://www.sap.com/transformation-templates" xmlns:ddic="http://www.sap.com/abapxml/types/dictionary" xmlns:def="http://www.sap.com/abapxml/types/defined">  <tt:root name="ROOT" type="ddic:ZST_T_TEST"/>  <tt:template>    <classes>      <tt:loop ref=".ROOT">        <class>          <tt:attribute name="name" value-ref="CLSNAME"/>            <definition>              <tt:value ref="$ref.SOURCE"/>              </definition>          <tt:loop name="b" ref="SOURCE">            <publicSection>              <tt:value ref="$b"/>            </publicSection>          </tt:loop>          <tt:loop name="b" ref="SOURCE">            <privateSection>              <tt:value ref="$b"/>            </privateSection>          </tt:loop>        </class>      </tt:loop>    </classes>  </tt:template></tt:transform>

first thing that really irritates me is that the syntax check says "type ... is not atomic" for the <definitions> tag. so how to read that specific value?

Next even when i put a loop around <definition> the loop of the <publicSection> is overwriting all previous entries, same for the loop of <privtaeSection>

And worse in my real XML <publicSection itself can contain lots of attributes and other stuff which i have to loop over as well.

so the Questions is: How can i append everything to just on table?

Regards