Added tinyxml2 readme.md.

modules/tinyxml2/native/readme.md

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+TinyXML-2 [![TravisCI Status](https://travis-ci.org/leethomason/tinyxml2.svg?branch=master)](https://travis-ci.org/leethomason/tinyxml2) [![AppVeyor Status](https://ci.appveyor.com/api/projects/status/github/leethomason/tinyxml2?branch=master&svg=true)](https://ci.appveyor.com/project/leethomason/tinyxml2)
+=========
+![TinyXML-2 Logo](http://www.grinninglizard.com/tinyxml2/TinyXML2_small.png)
+
+TinyXML-2 is a simple, small, efficient, C++ XML parser that can be 
+easily integrated into other programs.
+
+The master is hosted on github:
+https://github.com/leethomason/tinyxml2
+
+The online HTML version of these docs:
+http://grinninglizard.com/tinyxml2docs/index.html
+
+Examples are in the "related pages" tab of the HTML docs.
+
+What it does.
+-------------
+	
+In brief, TinyXML-2 parses an XML document, and builds from that a 
+Document Object Model (DOM) that can be read, modified, and saved.
+
+XML stands for "eXtensible Markup Language." It is a general purpose
+human and machine readable markup language to describe arbitrary data.
+All those random file formats created to store application data can 
+all be replaced with XML. One parser for everything.
+
+http://en.wikipedia.org/wiki/XML
+
+There are different ways to access and interact with XML data.
+TinyXML-2 uses a Document Object Model (DOM), meaning the XML data is parsed
+into a C++ objects that can be browsed and manipulated, and then 
+written to disk or another output stream. You can also construct an XML document 
+from scratch with C++ objects and write this to disk or another output
+stream. You can even use TinyXML-2 to stream XML programmatically from
+code without creating a document first.
+
+TinyXML-2 is designed to be easy and fast to learn. It is one header and
+one cpp file. Simply add these to your project and off you go. 
+There is an example file - xmltest.cpp - to get you started. 
+
+TinyXML-2 is released under the ZLib license, 
+so you can use it in open source or commercial code. The details
+of the license are at the top of every source file.
+
+TinyXML-2 attempts to be a flexible parser, but with truly correct and
+compliant XML output. TinyXML-2 should compile on any reasonably C++
+compliant system. It does not rely on exceptions, RTTI, or the STL.
+
+What it doesn't do.
+-------------------
+
+TinyXML-2 doesn't parse or use DTDs (Document Type Definitions) or XSLs
+(eXtensible Stylesheet Language.) There are other parsers out there 
+that are much more fully featured. But they are also much bigger, 
+take longer to set up in your project, have a higher learning curve, 
+and often have a more restrictive license. If you are working with 
+browsers or have more complete XML needs, TinyXML-2 is not the parser for you.
+
+TinyXML-1 vs. TinyXML-2
+-----------------------
+
+TinyXML-2 is now the focus of all development, well tested, and your
+best choice unless you have a requirement to maintain TinyXML-1 code.
+
+TinyXML-2 uses a similar API to TinyXML-1 and the same
+rich test cases. But the implementation of the parser is completely re-written
+to make it more appropriate for use in a game. It uses less memory, is faster,
+and uses far fewer memory allocations.
+
+TinyXML-2 has no requirement for STL, but has also dropped all STL support. All
+strings are query and set as 'const char*'. This allows the use of internal 
+allocators, and keeps the code much simpler.
+
+Both parsers:
+
+1.  Simple to use with similar APIs.
+2.  DOM based parser.
+3.  UTF-8 Unicode support. http://en.wikipedia.org/wiki/UTF-8
+
+Advantages of TinyXML-2
+
+1.  The focus of all future dev.
+2.  Many fewer memory allocation (1/10th to 1/100th), uses less memory
+    (about 40% of TinyXML-1), and faster.
+3.  No STL requirement.
+4.  More modern C++, including a proper namespace.
+5.  Proper and useful handling of whitespace
+
+Advantages of TinyXML-1
+
+1.  Can report the location of parsing errors.
+2.  Support for some C++ STL conventions: streams and strings
+3.  Very mature and well debugged code base.
+
+Features
+--------
+
+### Memory Model
+
+An XMLDocument is a C++ object like any other, that can be on the stack, or
+new'd and deleted on the heap.
+
+However, any sub-node of the Document, XMLElement, XMLText, etc, can only
+be created by calling the appropriate XMLDocument::NewElement, NewText, etc.
+method. Although you have pointers to these objects, they are still owned
+by the Document. When the Document is deleted, so are all the nodes it contains.
+
+### White Space
+
+#### Whitespace Preservation (default)
+
+Microsoft has an excellent article on white space: http://msdn.microsoft.com/en-us/library/ms256097.aspx
+
+By default, TinyXML-2 preserves white space in a (hopefully) sane way that is almost complient with the
+spec. (TinyXML-1 used a completely different model, much more similar to 'collapse', below.)
+
+As a first step, all newlines / carriage-returns / line-feeds are normalized to a
+line-feed character, as required by the XML spec.
+
+White space in text is preserved. For example:
+
+	<element> Hello,  World</element>
+
+The leading space before the "Hello" and the double space after the comma are 
+preserved. Line-feeds are preserved, as in this example:
+
+	<element> Hello again,  
+	          World</element>
+
+However, white space between elements is **not** preserved. Although not strictly 
+compliant, tracking and reporting inter-element space is awkward, and not normally
+valuable. TinyXML-2 sees these as the same XML:
+
+	<document>
+		<data>1</data>
+		<data>2</data>
+		<data>3</data>
+	</document>
+
+	<document><data>1</data><data>2</data><data>3</data></document>
+
+#### Whitespace Collapse
+
+For some applications, it is preferable to collapse whitespace. Collapsing
+whitespace gives you "HTML-like" behavior, which is sometimes more suitable
+for hand typed documents. 
+
+TinyXML-2 supports this with the 'whitespace' parameter to the XMLDocument constructor.
+(The default is to preserve whitespace, as described above.)
+
+However, you may also use COLLAPSE_WHITESPACE, which will:
+
+* Remove leading and trailing whitespace
+* Convert newlines and line-feeds into a space character
+* Collapse a run of any number of space characters into a single space character
+
+Note that (currently) there is a performance impact for using COLLAPSE_WHITESPACE.
+It essentially causes the XML to be parsed twice.
+
+### Entities
+
+TinyXML-2 recognizes the pre-defined "character entities", meaning special
+characters. Namely:
+
+	&amp;	&
+	&lt;	<
+	&gt;	>
+	&quot;	"
+	&apos;	'
+
+These are recognized when the XML document is read, and translated to their
+UTF-8 equivalents. For instance, text with the XML of:
+
+	Far &amp; Away
+
+will have the Value() of "Far & Away" when queried from the XMLText object,
+and will be written back to the XML stream/file as an ampersand. 
+
+Additionally, any character can be specified by its Unicode code point:
+The syntax `&#xA0;` or `&#160;` are both to the non-breaking space character. 
+This is called a 'numeric character reference'. Any numeric character reference
+that isn't one of the special entities above, will be read, but written as a
+regular code point. The output is correct, but the entity syntax isn't preserved.
+
+### Printing
+
+#### Print to file
+You can directly use the convenience function:
+
+	XMLDocument doc;
+	...
+	doc.SaveFile( "foo.xml" );
+
+Or the XMLPrinter class:
+
+	XMLPrinter printer( fp );
+	doc.Print( &printer );
+
+#### Print to memory
+Printing to memory is supported by the XMLPrinter.
+
+	XMLPrinter printer;
+	doc.Print( &printer );
+	// printer.CStr() has a const char* to the XML
+
+#### Print without an XMLDocument
+
+When loading, an XML parser is very useful. However, sometimes
+when saving, it just gets in the way. The code is often set up
+for streaming, and constructing the DOM is just overhead.
+
+The Printer supports the streaming case. The following code
+prints out a trivially simple XML file without ever creating
+an XML document.
+
+	XMLPrinter printer( fp );
+	printer.OpenElement( "foo" );
+	printer.PushAttribute( "foo", "bar" );
+	printer.CloseElement();
+
+Examples
+--------
+
+#### Load and parse an XML file.
+
+	/* ------ Example 1: Load and parse an XML file. ---- */	
+	{
+		XMLDocument doc;
+		doc.LoadFile( "dream.xml" );
+	}
+
+#### Lookup information.
+
+	/* ------ Example 2: Lookup information. ---- */	
+	{
+		XMLDocument doc;
+		doc.LoadFile( "dream.xml" );
+
+		// Structure of the XML file:
+		// - Element "PLAY"      the root Element, which is the 
+		//                       FirstChildElement of the Document
+		// - - Element "TITLE"   child of the root PLAY Element
+		// - - - Text            child of the TITLE Element
+		
+		// Navigate to the title, using the convenience function,
+		// with a dangerous lack of error checking.
+		const char* title = doc.FirstChildElement( "PLAY" )->FirstChildElement( "TITLE" )->GetText();
+		printf( "Name of play (1): %s\n", title );
+		
+		// Text is just another Node to TinyXML-2. The more
+		// general way to get to the XMLText:
+		XMLText* textNode = doc.FirstChildElement( "PLAY" )->FirstChildElement( "TITLE" )->FirstChild()->ToText();
+		title = textNode->Value();
+		printf( "Name of play (2): %s\n", title );
+	}
+
+Using and Installing
+--------------------
+
+There are 2 files in TinyXML-2:
+* tinyxml2.cpp
+* tinyxml2.h
+
+And additionally a test file:
+* xmltest.cpp
+
+Simply compile and run. There is a visual studio 2015 project included, a simple Makefile, 
+an Xcode project, a Code::Blocks project, and a cmake CMakeLists.txt included to help you. 
+The top of tinyxml.h even has a simple g++ command line if you are are *nix and don't want 
+to use a build system.
+
+Versioning
+----------
+
+TinyXML-2 uses semantic versioning. http://semver.org/ Releases are now tagged in github.
+
+Note that the major version will (probably) change fairly rapidly. API changes are fairly
+common.
+
+Documentation
+-------------
+
+The documentation is build with Doxygen, using the 'dox' 
+configuration file.
+
+License
+-------
+
+TinyXML-2 is released under the zlib license:
+
+This software is provided 'as-is', without any express or implied 
+warranty. In no event will the authors be held liable for any 
+damages arising from the use of this software.
+
+Permission is granted to anyone to use this software for any 
+purpose, including commercial applications, and to alter it and 
+redistribute it freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must 
+not claim that you wrote the original software. If you use this 
+software in a product, an acknowledgment in the product documentation 
+would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and 
+must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source 
+distribution.
+
+Contributors
+------------
+
+Thanks very much to everyone who sends suggestions, bugs, ideas, and 
+encouragement. It all helps, and makes this project fun.
+
+The original TinyXML-1 has many contributors, who all deserve thanks
+in shaping what is a very successful library. Extra thanks to Yves
+Berquin and Andrew Ellerton who were key contributors.
+
+TinyXML-2 grew from that effort. Lee Thomason is the original author
+of TinyXML-2 (and TinyXML-1) but TinyXML-2 has been and is being improved
+by many contributors.
+
+Thanks to John Mackay at http://john.mackay.rosalilastudio.com for the TinyXML-2 logo!
+
+