Property definitions

markdown $ LinkRef :: defaultinit
# A Link Reference.
# Links that are specified somewhere in the mardown document to be reused as shortcuts.
#
# ~~~raw
# [1]: http://example.com/ "Optional title"
# ~~~
class LinkRef

	# Link href
	var link: String

	# Optional link title
	var title: nullable String = null

	# Is the link an abreviation?
	var is_abbrev = false

	# Create a link with a title.
	init with_title(link: String, title: nullable String) do
		init(link)
		self.title = title
	end
end
lib/markdown/markdown.nit:613,1--635,3