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* all functions return a single "error" node in the case that something went wrong
* otherwise they return one or more "result" nodes that contain the function results and may be distinguished by one or more attributes
* this makes handling the return values easier and more pleasing to the eye as not everything has to be prefixed by "self::*"
* updated test transformation accordingly
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* XML tree is contained below the _content_ node if read was successful
** status is set to error otherwise
* updated test transformation accordingly
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* A call to _read-file_ now returns a _content_ and _status_ node
** this enables XSL transformations to easily react to io related errors
* fixed bug in path resolution
** boost::filesystem _canonical_ method is throwing and exception when the given path does not exist, this pulled down the whole stack
** replaced call to _canonical_ with call to _absolute_ which does not have this requirement
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* execute member method internal argument count checks are not needed when using between one and two arguments
** xalan automatically generates the appropriate message containing the getError message when only offered fixed argument execute member overloads
* improved FunctionReadDirectory attribute element generation
* added additional validations to FunctionReadFile and FunctionReadXMLFile
* I plan to return errors inside a DOM tree alongside the function return values in the future
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* this class provides methods for resolving paths relative to the contained base path
* other filesystem interaction methods will also be implemented in this class
** for instance directory traversal
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* while plain read access on files is doesn't require boost::filesystem it will greatly simplify the implementation of external directory traversal functions
* it also improves the portability of relative path construction
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* there is no reason for performing system-calls instead of using the features offered by the standard library in this situation
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* one expects a read-file function to work relative to the directory the transformation is located and not to the executable's location
** from the perspective of the user the transformation is the application, not the actual executable
* removed PlattformGuard struct from TransformerGuard (now TransformerFacade)
* TransformerFacade is instatiated with the appropriate relative working path
** i.e. it will have to be instantiated for every directory containing one or more transformations
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* .. in the face of the planned development of usable external functions using the current proof-of-concept coding
* replaced usage of std::shared_ptr in FunctionReadXmlFile class with explicit implementation of default and copy constructor
* separated implementation and interfaces
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