What is the meaning of the icons used in Arbil?

See http://www.lat-mpi.eu/tools/arbil/manual/ch01s04.html

For

Component Metadata Infrastructure

See: http://www.clarin.eu/cmdi

, some additional icons are used and some icons have a slightly different meaning:

	link to an external file (ResourceProxy)
	grouping icon for repeatable elements (more information...)
	root node of a CMDI file