Washington state's caucus-ballot primary confuses

So Washington state's current primary system isn't just caucus or ballots, it seems to be a combination of the two. But upon further examination into the the document provided by the Secretary of State, I was able to find one clear sentence out of many unclear ones:

"The Democratic Party will base 100% of its delegate selection on the results of the caucus system."

So although there is a caucus on Febuary 9th, and a primary on Febuary 19th, and an oath seems to be involved, the delegate count is based on the caucus results. Huh? I'm posting the document below. And, any light that can be shed for our Washington state voters, and curious Washington state voting policy observers, is tremendously appreciated.

http://www.secstate.wa.gov/elections/2008/WAsCaucusesandPrimaries.pdf