In an optical disk apparatus, when the write-in process to the optical disk is interrupted, a data processing part and an encoder part are set to be in the waiting state after an access to a data storing part is completed, so as to stop accessing the data storing part and also to stop storing data that is to be written. The described framework and format define a set of building blocks for composing, packaging, distributing, and rendering document-centered content. The arm may be coupled to a connection clip that can grip a selected line.