diff --git a/Sources/SGFKit/Collection+SGF.swift b/Sources/SGFKit/Collection+SGF.swift
index b1ee2d9..fef6c84 100644
--- a/Sources/SGFKit/Collection+SGF.swift
+++ b/Sources/SGFKit/Collection+SGF.swift
@@ -1,12 +1,12 @@
 extension Collection {
     
     /// Converts the collection to a SGF text.
-    func convertToSGF() -> String {
+    public func convertToSGF() -> String {
         convertToNonTerminalSymbol().convertToSGF()
     }
     
     /// Converts the collection to non terminal symbols.
-    func convertToNonTerminalSymbol() -> NonTerminalSymbols.Collection {
+    public func convertToNonTerminalSymbol() -> NonTerminalSymbols.Collection {
         let gameTrees = nodes.map { gameTree(from: $0) }
         return NonTerminalSymbols.Collection(gameTrees: gameTrees)
     }
diff --git a/Sources/SGFKit/Node.swift b/Sources/SGFKit/Node.swift
index 5f9bbf2..a823d17 100644
--- a/Sources/SGFKit/Node.swift
+++ b/Sources/SGFKit/Node.swift
@@ -37,7 +37,7 @@ public final class Node<Game: SGFKit.Game> {
     
     /// Makes the node.
     /// - Parameter properties: The property of the node.
-    public init(properties: [Property]) {
+    public init(properties: [Property] = []) {
         self.number = nil
         self.properties = properties
     }