9871
He has worked closely with visual artist / musician Robert Longo , particularly in the 1980 s , and on an experimental opera called XS : The Opera Opus ( 1984 - 6 ) with the visual artist Joseph Nechvatal .
 person: Robert Longo; person: Joseph Nechvatal
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Robert Longo; person: Joseph Nechvatal