Extends the attribute group key.extra.attrib (which takes part in the attribute list of <key>) by adding the attribute yfiles.type which is defined below.
Extends the attribute group node.extra.attrib (which takes part in the attribute list of <node>) by adding a yfiles specific attribute for the folder type.
Extends the type data-extension.type to allow specifically the content below (i.e. text only or all defined edge and node relaizers, resource blocks or postprocessors)
Valid values are