Assertion: sign language | /r/HasProperty | documented
Facets:
Source sentences:
text: The process appears to be very common in those sign languages that have been best documented, such as American Sign Language, British Sign Language and Auslan.
text: Many sign languages have developed independently throughout the world, and no first sign language can be identified.
text: Although a government may stipulate in its constitution (or laws) that "sign language" is recognised, it may fail to specify which sign language; several different sign languages may be commonly used.
text: Sarah Batterbury has argued that sign languages should be recognized and supported not merely as an accommodation for the disabled, but as the communication medium of language communities.