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* up until now all external functions were locally installed to a specific XalanTransformer instance contained within a TransformationGuard instance
** this had to change as I planned to add a "execute-transformation" function based on TransformationGuard which would have led to recursive self-instantiation
** global external functions have to be thread-safe
* as global external function can not be provided with a reference to a transformation-specific FilesystemFacade instance, the working path is now determined using xalan::Locator
** currently using pointer arithmetics on XMLCh* to remove the "file://" prefix of the URI returned by locator->getSystemId(), may be unsafe
* added compilation unit for PlattformGuard as it now contains function installation in addition to plattform lifetime management
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* XSLT stylesheets may be provided with a set of initial parameters
** these parameters can be provided as the second argument to the generate member method in the form of a string to string mapping
** the XSLT standard also permitts number and node set types as value arguments of such input parameters but this is not supported by this change
* expanded test transformation to demonstrate this feature
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* A global DomDocumentCache instance would require key prefixing
* switched internal data structure to std::unordered_map for average constant time access
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* the plan to return XML-nodes from each external function requires a better way to manage the lifetime of many xerces DOM document instances and their support class instances
** this is why DomDocumentCache and DomDocumentCache::item were implemented
** based on std::map so we can easily access the result of old function calls
* changed external read-directory function to return the children of the document node instead of the document node itself
** removes unnecessary cruft in function calls
** will make returning status codes alongside the function result more pleasing to the eye
* updated test transformation to reflect new features
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* they are marked appropriately by a _type_ attribute
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* contains a single, compiled transformation as specified by its construction argument
* uses the transformation's location as the FilesystemContext
* allows generation of output documents using _generate_ member method
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