http://hl7.org/fhir/StructureDefinition/implementationguide-sourceFile|5.2.0

Identifies files used as part of the the publication process other than resources referenced in definition.resource.

Name	Card	Type	Description & Constraints
Extension	0..*		Additional files used in publication
extension *	1..1		Location on server
extension	?..0
url	?..?
value[x] *	1..?
valueReference *	1..?	Reference
extension *	1..1		Path for publisher
extension	?..0
url	?..?
value[x] *	1..?
valueString *	1..?	string
extension	0..1		Use attachment or resource?
extension	?..0
url	?..?
value[x] *	1..?
valueBoolean *	1..?	boolean
url	?..?
value[x]	?..0