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SAP ST SYMMETRY documentation, setup help and example usage
ARTICLE
ST - Symmetry of Serialization and Deserialization
The language constructs of Simple Transformations support the formulation of reversible transformations, that is, of programs that p
rovide the original values in the execution sequence serialization - deserialization (or vice versa). However, it is also possible to write programs that cannot be reversed.
Example
This simple example illustrates a non-symmetrical transformation. Since the tt.value commands are not enclosed in separate elements, the serialized values of ROOT1 and
ROOT2 are grouped in X .
xmlns:tt="http://www.sap.com/transformation-templates"
tt:root name="ROOT1"/
tt:root name="ROOT2"/
<(><<)>tt:template>
<(><<)>X>
tt:value ref="ROOT1"/
tt:value ref="ROOT2"/
<(><<)>/X>
<(><<)>/tt:template>
/tt:transform
The following ABAP program can call the transformation:
DATA field1 TYPE string VALUE 'Hello'.
DATA field2 TYPE string VALUE ' World!'.
DATA result1 like field1.
DATA result2 like field2.
CALL TRANSFORMATION ...
SOURCE root1 = field1
root2 = field2
RESULT XML xml_string.
CALL TRANSFORMATION ...
SOURCE XML xml_string
RESULT root1 = result1
root2 = result2.
The result of the serialization is:
X Hello World! /X
Accordingly, the result of the deserialization to result1 is
"Hello World!" , while result2 retains its initial value, which is different from the original content of field1 and field2
.
For a symmetrical transformation, the tt:value commands each have to appear in separate elements or they must be separated by a unique text (which cannot appear in the first value).
Documentation extract taken from SAP system, � Copyright SAP AG. All rights reserved
