# Sanity check for taxonomies automatically generated from a SKOS RDF/XML source.
# Author: Andrew Sales
# Date: 20161220
# Version: 0.3
# Comments: 
#   20161220 [AS] Added search relevance prologue

default namespace = ""
namespace rel = 'http://rdf.bloomsbury.com/ssp/search#relevance'

start =
  element taxonomy {
    attribute id { text },
    attribute name { text },
    attribute releaseDate { xsd:date },
    xmlBase?,
    search-relevance-prologue?,
    facet+
  }
facet =
  element facet {
    attribute behaviour { string 'subject' }?,
    (attribute xml:id { xsd:ID } | attribute xref{ xsd:IDREF }),
    attribute sortAs { string }?,
    xmlBase?,
    (browse-display-atts|relevance-atts),
    (facet
     | element names {
         element name {
           attribute level { xsd:NCName },
           attribute xml:lang{ xsd:language }?,
           text
         }+
       })*
  }

xmlBase = attribute xml:base{ xsd:anyURI }

browse-display-atts =
attribute suppressInBrowse { xsd:boolean }?,
    attribute displayHint {'alphaSorted'}?

relevance-atts =
    attribute rel:combinedMatchOnly{ xsd:boolean }?,
    attribute rel:matchCombination{ xsd:IDREFS }?,
    attribute rel:minimumMatchLevel{ xsd:int }?,
    attribute rel:minimumMatches{ xsd:int }?
    
#defines the relevance of search results 
search-relevance-prologue =
    element rel:relatedContent{
        element rel:ranking {
            attribute type{ string 'relevance' }?,
            facet+
        }
    }