You can still work with references:
Code:
-- select a single task in the content panel of OF, and run
tell application id "OFOC"
tell default document
tell front document window
set oTask to (value of first selected tree of content)
tell oTask to set refNote to a reference to its note
tell refNote
insert "OmniGroup " at before paragraphs
set refWord to a reference to first word
set oStyle to a reference to style of refWord
set oLink to a reference to attribute "link" of oStyle
set value of oLink to "http://www.omnigroup.com"
end tell
end tell
end tell
end tell