XML documents are often generated by some application in order to
be processed by a another program. For a correct exchange of information
it has to be guaranteed that for correct inputs only correct outputs
are produced. The shape of correct documents, i.e., their type, is
usually specified by means of schema languages. This thesis is
concerned with methods for statically guaranteeing that
transformations are correct with respect to pre-defined
types. Therefore, we consider the XML transformation language TL
abstracting the key features of common XML transformation
languages. We show that each TL program can be decomposed into at most three
stay macro tree transducers. By means of classical results for
stay macro tree transducers, this decomposition allows to formulate
a type checking algorithm for TL. This method, however, has even
for small programs an exorbitant run-time. Therefore, we develop an alternative approach, which allows at least
for a large class of transformations that they can be type checked
in polynomial time. The developed algorithms have been implemented and
tested for practical examples.
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XML documents are often generated by some application in order to
be processed by a another program. For a correct exchange of information
it has to be guaranteed that for correct inputs only correct outputs
are produced. The shape of correct documents, i.e., their type, is
usually specified by means of schema languages. This thesis is
concerned with methods for statically guaranteeing that
transformations are correct with respect to pre-defined
types. Therefore, we consider the XML tra...
»