The Tanzil project's Uthmani distribution is used as the Arabic source of the Quran. According to the Tanzil website, this text has been through manual verification against the Medinah Mushaf.
Several options may be specified when downloading the Quranic text from http://tanzil.info. The download options used by the JQuranTree library are as follows:
|Different tanween shapes||No|
|File size||1522044 bytes|
The Uthmani XML file is included as an embedded resource in the JQuranTree JAR file, located at: /tanzil/quran-uthmani.xml.