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* InputXSLT::ErrorHandler is derived from xercesc::ErrorHandler and enables contextual printing of transformation errors
** currently this means that the error messages passed to std::cerr contain the full path of the offending transformation
* added input trimming to the external transform function
** calls to this function from inside a transformation may contain unnecessary whitespace characters which disrupt further processing
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* wraps result node construction and appends it to root node on destruction
* offers a simpler interface for common node construction patterns
* simplifies result node construction in all external function implementations
** most noticeable in FunctionReadDirectory
* expanded FunctionReadDirectory result nodes by name, extension, and full-path nodes
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* if a given file can not be located relative to the transformation's location both "read-file" and "read-xml-file" will now try to resolve the path using the IncludeEntityResolver
* all external functions based on the FunctionBase template are now provided with a pointer to a IncludeEntityResolver instance
* it is determined by the external function implementation whether include path resolution will be used
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* xalan / xerces offers the possibility of implementing custom entity resolvers which are called upon by "<xsl:include..."
** such a custom resolver was implemented to resolve include path entities
* this is a much better way to support include paths than offering a custom external "resolve-include" function
* as entity paths are expanded before they are passed to the entity resolver, a special "[path]" syntax simmilar to "#include <path>" had to be implemented
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* names matter, from now on parameters to external functions will be called parameters uniformly instead of mixing arguments and parameters
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* the given XObject is passed to the called transformation
** this was done to enable templates to pass information to each other
** this should support any type usable in a XPath context to be passed as an argument
* expanded FunctionTransform test case accordingly
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* FunctionBase::argument_tuple is a std::tuple specialization type specialized on the argument types passed inside the variadic template argument of FunctionBase
* added tuple Mapper and XObjectValue helper namespaces containing recursive tuple construction and XObjectPtr value extraction logic
* changed all external function implementations accordingly
* this change was implemented to uniformly support different external function argument types than std::string
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* external functions may expect arguments with a type different from boost::filesystem::path so they are only provided raw string values
* moved xalan string conversion logic into separate compilation unit
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* constructDocument member method is provided with a FunctionBase::argument_array instance
* improved argument validation in FunctionBase
* this parameter was added to support FunctionBase as a base class for FunctionTransform
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* "InputXSLT:transform" expects two input arguments and executes the given transformation into the given target file
** this function respresents a important step in the direction of making it possible to write an actual static site generator on top of InputXSLT using XSLT
* added basic "transform" test case
* updated README.md to include this new function
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