Extension types

a part of the whole text.

significance in a given context.

phonetic, morphological or structural. It brings unity to the whole or some certain part of a text.
Ex.: So long as men can breathe or eyes can see
So long lives this and this gives life to thee.
  (W. Shakespeare)

whole work that provide its thematic and compositional cohesion.
Ex.: Joe kept saying he did not want a fortieth birthday party. He said he did not like parties—a palpable untruth—and particularly and especially a large party in honor of his reaching forty...
At first there were going to be forty guests but the invitation list grew larger and the party plans more elaborate, until Arthur said that with so many people they ought to hire an orchestra, and with an orchestra there would be dancing, and with dancing there ought to be a good-size orchestra. The original small dinner became a dinner dance at the Lantenengo Country Club. Invitations were sent to more than three hundred persons... (Ten North Frederick by O'Hara)

the linear and logical organization of the text.
Ex.: Miss Fairfax, ever since I met you I have admired you more than any girl... I have met... since I met you. («The Importance of Being Earnest» by O.Wilde)

The door opened and from the cushions within emerged a tall young man in a clinging dove-gray coat. After him, like the first breath of spring in 'he Champs-Elysee came Mrs. Beste-Chetwynde—two lizard-skin feet, silk legs, chinchilla body, a tight little black hat, pinned with platinum and diamonds, and the high invariable voice that may be heard in any Ritz Hotel from New York to Budapest. («Decline and Fall» by E. Waugh)