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#
# Generate Century Index
# Hypertext link may trigger Corese server 
# Answer using SPARQL Template Transformation
#
prefix cn: 

template cn:index(?title) {

format {
  """
  %s %s %s
  
  
  """

  if (bound(?before), 
    st:format("Avant  ", st:plink(?before)), 
    "")
    
  st:call-template(cn:elem, ?title) 
  
  if (bound(?after), 
    st:format("Après", st:plink(?after)), 
    "")  
}

st:call-template(cn:list)   

}
where {

  ?century rdfs:label ?title ; 
    cn:start ?min 
       
  bind (if (?min = 1, 0, ?min) - 100 as ?be)
  bind (if (?min = -100, -99, ?min) + 100 as ?af)
  bind (coalesce(st:get(st:min), -1000) as ?fst)
  bind (coalesce(st:get(st:max),  3000) as ?rst)
  
  optional { ?before cn:start ?be filter (?be >= ?fst) }
  optional { ?after  cn:start ?af filter (?af <= ?rst) }
}