About the Geogebra Filter :
The Geogebra Filter makes use of XSLT ( Extensible Stylesheet Language Transformations ). Qt's XmlPatterns Module is used for providing support for XSLT. Using XSLT we first convert the XML representation of the Geogebra files into a more suitable intermediate representation from which constructing the ObjectCalcers ( and thus the objectHolders ) is easier and homogenous for most object-types. We use the callback interface provided by the QAbstractXmlReceiver class to read the transformed XML and construct the objects present in the document.

SEE ALSO: README