feat(xml): add XML functions

vendor/expat-2.0.1/bcb5/README.txt

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+
+                   Using a Borland compiler product
+
+The files in this directory support using both the free Borland command-line
+compiler tools and the Borland C++ Builder IDE.  The project files have been
+tested with both versions 5 and 6 of the C++ Builder product.
+
+             Using the free BCC32 command line compiler
+
+After downloading and installing the free C++ Builder commandline version,
+perform the following steps (assuming it was installed under C:\Borland\BCC55):
+
+1) Add "C:\Borland\BCC55\BIN" to your path
+2) Set the environment variable BCB to "C:\Borland\BCC55".
+3) edit makefile.mak: enable or comment out the appropriate commands under
+   clean & distclean, depending on whether your OS can use deltree /y or
+   del /s/f/q.
+
+After that, you should simply cd to the bcb5 directory in your Expat directory
+tree (same structure as CVS) and run "make all" or just "make".
+
+                               Naming
+
+The libraries have the base name "libexpat" followed optionally by an "s"
+(static) or a "w" (unicode version), then an underscore and optionally
+"mt" (multi-threaded) and "d" (dynamic RTL).
+
+To change the name of the library a project file produces, edit the project
+option source (see step 1 under Unicode below) and change the name contained in
+the PROJECT tag. In a make file, change the value assigned to the PROJECT
+variable. Also, the LIBRARY entry in the .def file has to be changed to
+correspond to the new executable name.
+
+
+                       Unicode Considerations
+
+There are no facilities in the BCB 5 GUI to create a unicode-enabled
+application. Fortunately, it is not hard to do by hand.
+
+1. The startup .obj system file must be changed to the unicode version.
+   Go to Project|Edit Option Source, and scroll down to the ALLOBJ tag. Change
+   c0x32.obj to c0x32w.obj. Editing this file can be quirky, but usually the
+   following kludge will make the change stick. Close and save the file
+   (CTRL-F4) then open the options dialog (CTRL-Shift-F11), then click OK on
+   the dialog immediately without changing anything in it. If this doesn't work,
+   you will have to close the project completely and edit the .bpr file by hand.
+
+   If you are using a make file, just change the startup .obj file assigned
+   to the ALLOBJ variable.
+
+2. Add the macro define XML_UNICODE_WCHAR_T. In the GUI that goes in the options
+   dialog, Directories/Conditionals tab, in the Conditional define box. In a
+   make file, put it in the USERDEFINES variable.
+
+3. Of course, your code has to be written for unicode. As a start, the "main"
+   function is called "wmain". The tchar macros are an interesting way to
+   write code that can easily switch between unicode and utf-8. If these macros
+   are used, then simply adding the conditional define _UNICODE as well as
+   XML_UNICODE_WCHAR_T will bring in the unicode versions of the tchar macros.
+   Otherwise the utf-8 versions are used. xmlwf uses its own versions of the
+   tchar macros which are switched on and off by the XML_UNICODE macro, which
+   itself is set by the XML_UNICODE_WCHAR_T define.
+
+                              Threading
+
+The libexpat libraries are all built to link with the multi-threaded dynamic RTL's.
+That means they require CC32xxMT.DLL present on the installation target.
+To create single-threaded libs, do the following:
+
+1. The compiler option for multi-threading must be turned off. Following the
+   instructions above to edit the option source, remove the -tWM option from
+   the CFLAG1 tag. In a make file, remove it from the CFLAG1 variable.
+
+2. The single threaded RTL must be called. change the RTL in the ALLLIB tag or
+   variable (GUI or makefile repectively) to the version without the "mt" in the
+   name. For example, change cw32mti.lib to cw32i.lib.
+
+                              Static RTL's
+
+To build the libs with static RTL's do the following,
+
+1. For the static expatlibs, in the Tlib tab on the options dialog, uncheck the
+   "Use dynamic RTL" box. For the dynamic expatlibs, in the Linker tab on the
+   options dialog, uncheck "Use dynamic RTL". If you are using a make file,
+   remove the _RTLDLL assignment to the SYSDEFINES variable, and change the RTL
+   to the version without an "i" in the ALLLIB variable. For example,
+   cw32mti.lib would become cw32mt.lib.