But up to now, it is still no possible, to express structural constraints like:
if the document has the maturity level "approved", the signature element is necessary.
Therfore the element <DCI-OCCURENCE> is able to formulate such an expression.
First, the xpath-Statment select the neccessary part of the document. Then, it will be looked, whether other elements have a defined occurence (in the example above - the signature element must occur 1 time.
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