To accomplish this a special lexicon service extension that also functions as a media provider should be used. First set up the lexicon service (see the section called “Setting up a Lexicon Service” ). Next, connect the lexicon service to a tier type (see the section called “Set the Lexicon Service and entry field information for a Tier Type”) that is also connected to a external controlled vocabulary with entry IDs that can be used by the lexicon service (see the section called “Associating a tier type with Controlled Vocabularies”).

An example of a lexicon service extension that does all this is the Signbank extension. It connects to a Signbank web service (the original Signbank: http://www.auslan.org.au/, several spin offs: https://github.com/Signbank) that also provides a corresponding ECV containing the necessary data.

	Note
	The media displayer now also works for external references of annotations, in case the referent is video (see the section called “Associating an annotation with an external resource”.