     
     let blanksCount = blanks.count
     let irisAndBlanksCount = iris.count + blanksCount
-
+    
     var mapping = [Int:Term]()
     for (i, term) in blanks.enumerated() { // blanks don't have inherent ordering amongst themselves
         mapping[i] = term

    var literals = Set<Term>()
    for filename in files {
        #if os (OSX)
            guard let path = NSURL(fileURLWithPath: filename).absoluteString else { throw DatabaseError.DataError("Not a valid graph path: \(filename)") }
        #else
            let path = NSURL(fileURLWithPath: filename).absoluteString
        #endif
        let graph   = defaultGraphTerm ?? Term(value: path, type: .iri)

        iris.insert(graph)
        
        let parser = RDFParserCombined()

/**
 Print all the quads present in the database's QuadStore. If an index name is supplied,
 use it to print quads in its native order.
 
 - parameter index: The name of an index to use to sort the resulting output.
 */
func serialize<D : PageDatabase>(_ database: D, index: String? = nil) throws -> Int {
