| http://www.w3.org/ns/prov#value | - In addition, although an example of one kind of headline has been described in this embodiment, it is possible to form the documents with various kinds of headlines by finely preparing a plurality of format definitions and format commands such as ???Big Headline???, ???Middle Headline???, ???Subhead???, ???Level-1 Headline???, ???Level-2 Headline???, etc.
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