Question: Is Tag:historic:civilization=byzantine the OSM tag or key for the Byzantine Empire?
Choices: yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
SPARQL: ASK { ?e <pred:name> "Byzantine Empire" . ?e <OSM_tag_or_key> ?pv . ?pv <pred:value> "Tag:historic:civilization=byzantine" .  }
Program:
function: Find
inputs: Byzantine Empire
function: QueryAttr
dependencies: 0
inputs: OSM tag or key
function: VerifyStr
dependencies: 1
inputs: Tag:historic:civilization=byzantine
Answer: yes