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-RWD050
-======
+# RWD050
 
 Repository for the Smart Home Device Template (SDT).
 
-Note that this project runs under Apache 2.0 license. Read the license in this repository, or refer to
-
-http://www.apache.org/licenses/LICENSE-2.0.html
+Note that this project runs under Apache 2.0 license. Read the [LICENSE](LICENSE) in this repository, or refer to [http://www.apache.org/licenses/LICENSE-2.0.html](http://www.apache.org/licenses/LICENSE-2.0.html)
 
 Any contributions made to this project must comply with the forementioned license.
 
+---
+
+You can find further Information here:
+
+- [SDT Build System](SDT%20Build%20System.md)
+- [LICENSE](LICENSE)
+
diff --git a/SDT Build System.md b/SDT Build System.md
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+# SDT Build System
+This document describes the SDT build system and how to build the SDT and validate new contributions.
+
+## Directory Structure and Important Files
+- [SDT/schema/](SDT/schema/) : Base directory
+- [SDT/schema/src/](SDT/schema/src/) : Source files of the SDT.
+	- [domain.rng](SDT/schema/src/domain.rng) : RELAX NG file with the SDT schema definition. This is the source file that is converted to the actual schema definition *domain.xsd* during the build. See also [http://en.wikipedia.org/wiki/RELAX_NG](http://en.wikipedia.org/wiki/RELAX_NG).  
+	**Only edit this file when one wants to make changes to the SDT!**
+	- [domain.xsd](SDT/schema/src/domain.xsd) : The SDT schema defintion that is generated from *domain.rng*.
+	- [xml.xsd](SDT/schema/src/xml.xsd) : General schema definitions for the SDT
+- [SDT/test/](SDT/test/) : This directory contains all XML files with SDT definitions that should be validated whether they conform to the SDT schema. This could be example definitions or contributions.
+- [SDT/schema/build.xml](SDT/schema/build.xml) : This is the definition file for the ant build system.
+- [SDT/schema/etc/](SDT/schema/etc/), [SDT/schema/lib/](SDT/schema/lib/), [SDT/schema/style/](SDT/schema/style/) : internal directories for the build system. Please, don't make unnecessary changes to these files.
+
+## Installation
+- Install Java on your computer
+- Download and install Apache ant from [http://ant.apache.org](http://ant.apache.org)
+- Clone the SDT repository from GitHub:
+
+		git clone https://github.com/Homegateway/RWD050.git
+	
+## How to Use the Build System
+After cloning the repository go to the directoy *SDT/schema* and run commands depending on what you want to achieve.
+
+### Build the Schema
+Running *ant* without any parameter builds the schema definition from the rng-definition [SDT/schema/src/domain.rng](SDT/schema/src/domain.rng) and writes it to [SDT/schema/src/domain.xsd](SDT/schema/src/domain.xsd)
+
+	$ cd SDT/schema
+	$ ant
+
+### Validate SDT Definitions
+You can use the build system to validate new SDT definitions or changes made to existing ones by running the following command:
+
+	$ cd SDT/schema
+	$ ant validate
+
+The last lines of the many screens full of output you receive should look something like this:
+
+>[schemavalidate] 2 file(s) have been successfully validated.  
+>BUILD SUCCESSFUL  
+>Total time: 1 second
+
+Otherwise you most likely receive a stacktrace. Search the output for the line *BUILD FAILED*. Above this line you will find some helpful hints for the filename and line number on which the error occured (here: file *mseeb.xml* on line 66) and a reason:	
+
+>[schemavalidate] /Users/someone/Sources/git/RWD050/SDT/schema/test/mseeb.xml:66:18: cvc-elt.1: Cannot find the declaration of element 'Domain'.    
+>BUILD FAILED
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