From 8324dbe828434310b24573f7c4f659a3be86bcc4 Mon Sep 17 00:00:00 2001
From: mtj0928 <mtj0928@users.noreply.github.com>
Date: Wed, 31 Dec 2025 17:40:20 +0900
Subject: [PATCH] Refine interface

---
 Sources/SGFKit/Collection+SGF.swift | 4 ++--
 Sources/SGFKit/Node.swift           | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

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
     }