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i.e. the directory tree was not correctly created in all circumstances which led to both the `generate` and `write-file` test cases failing. This was combined with some accumulated changes such as the extraction of process context instantiation.
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* e.g. member functions defined in the class definition are implicitly marked `inline`
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* this is possibly a breaking change for all applications built on either `FunctionExternalCommand` or `FunctionReadFile`
** e.g. meta datasource XPath queries in _StaticXSLT_ will have to be changed to accomodate this
* the reason for doing this was to fix the behaviour when reading namespaced XML files
** e.g. XSL stylesheets could only be queried with a clunky XPath expression such as `$transformation/self::*[name() = 'xsl:stylesheet']` instead of simply `$transformation/self::xsl:stylesheet`
*** this was caused by the now activated namespace comprehension in `xercesc::XercesDOMParser` which is disabled by default
*** it caused all local node names to be converted into their namespace prefixed version, e.g. `local-name()` returned `xsl:stylesheet` instead of `stylesheet`
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* `FunctionExternalCommand` failed to offer correct output handling when provided with a valid XML document which included a XML declaration
** `xerces::XercesDOMParser` generated the appropriate errors but they were not handled by `FunctionExternalCommand`
** wrapping is not necessary for full XML documents but is required for invalid XML as returned by e.g. common _Markdown_ processors
*** if wrapping is applied to full XML documents which include a XML declaration the parser and subsequently the complete external function fails
* added error parser handling by making the compilation unit local `importDocumentElement` method return value optional
* added XML declaration detection and handling to `readOutput`
** if XML declaration is detected no wrapping is applied
* added wrapping detection in `FunctionExternalCommand::constructDocument`
** if no wrapping is detected the whole tree is returned as content instead of just returning its child nodes
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* long outputs to stdout from child processes filled up the `boost::process::pistream` buffer and caused `write` to block
** this issue was circumvented by reading the stream into a `std::stringstream` instance before retrieving the blocking exit status
* modified document import implementation accordingly
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* changed the XObjectValue constructor to accept a pointer to FilesystemContext instead of instantiating the context by itself
* the FilesystemContext is now instantiated in the "callConstructDocument" member method of "FunctionBase"
** a const reference to FilesystemContext is passed to all "constructDocument" member method implementations
* the FilesystemContext is currently only used by FunctionExternal command to set the correct work directory in "boost::process::context"
** this is required so calling external commands from inside a stylesheet works as expected
*** i.e. from inside the directory the stylesheet is located in
* modified all remaining external function implementations accordingly
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* this change was implemented to match the naming scheme of all other external functions
* updated external text formatter test case accordingly
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* renamed FunctionExternalTextFormatter into FunctionExternalCommand
** the goal is to provide a general interface to a variety of external commands
*** e.g. not just text formatters but system utilities for file management and so on
** this requires the stdin parameter to be optional as not all external commands require stdin input
* implemented "filter_derived" helper template to determine amount of optional parameters
** optional parameters are defined as "boost::optional" specializations
*** they in turn can be detected by checking if "boost::optional_detail::optional_tag" is a base class
* "callConstructDocument" member method of "FunctionBase" performs additional bounds checking of parameter vector
* "boost::optional<std::string>" specific member overload was added to "XObjectValue" helper class
** we will have to provide full specializations for all optional types as C++ prohibits partial member function template specialization
* renamed the external function in "PlattformGuard"
* changed README.md and test cases accordingly
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