allExtensions = new ArrayList<ExtensionDescription>();
for (int i = 0; i < extensions.length; i++) {
List<Vertex> readableFormats = new ArrayList<Vertex>();
List<Vertex> writeableFormats = new ArrayList<Vertex>();
IConversionExtension conversionExtension = null;
IExtension extension = extensions[i];
IConfigurationElement[] configurations = extension.getConfigurationElements();
for (int j = 0; j < configurations.length; j++) {
IConfigurationElement element = configurations[j];