| http://www.w3.org/ns/prov#value | - Moreover, not only description languages for realizing a single modality, for example, a description language dealing with only the screen or voice, but also description languages such as X+V and SALT for realizing multi-modality including a combination of screen and voice, and description languages such as XISL extendable to applications other than screen and voice are used (see Japanese Patent A
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