diff --git a/index.php b/index.php
index c1f71d0..ca49a00 100644
--- a/index.php
+++ b/index.php
@@ -49,6 +49,7 @@ try {
 				$tmp = SiteMeta::getBookshelf()->getBook($uri[0]);
 				if ($tmp == null)
 					throw new RequestNotExistException("Book required \"$uri[0]\" not found!");
+				PageMeta::$bookId = $uri[0];
 				PageMeta::$book = $tmp->getContentedNode();
 			}
 			
@@ -58,12 +59,13 @@ try {
 				if ($tmp == null) throw new RequestNotExistException("Page required \"$uri[1]\" not found on book \"$uri[0]\"!");
 				PageMeta::$page = $tmp;
 			} else {
-				PageMeta::$page = PageMeta::$book->getChilds()->getChildren()[0];
+				PageMeta::$page = PageMeta::$book->getChildren()->getChildren()[0];
 			}
 		} else {
 			// 主页面
+			PageMeta::$bookId = "%root";
 			PageMeta::$book = SiteMeta::getBookshelf()->getRootBook();
-			PageMeta::$page = PageMeta::$book->getChilds()->getChildren()[0];
+			PageMeta::$page = PageMeta::$book->getChildren()->getChildren()[0];
 			PageMeta::$isMainPage = true;
 		}
 		
diff --git a/src/Data/PageMeta.php b/src/Data/PageMeta.php
index 50bb544..efbccdd 100644
--- a/src/Data/PageMeta.php
+++ b/src/Data/PageMeta.php
@@ -8,6 +8,7 @@ use SukWs\Bookshelf\Element\BookContent\Page;
 
 class PageMeta {
 	
+	public static string $bookId;
 	public static BookContented $book;
 	public static Page $page;
 	public static bool $isMainPage = false;
diff --git a/src/Element/Book.php b/src/Element/Book.php
index d9b2e7d..26bd001 100644
--- a/src/Element/Book.php
+++ b/src/Element/Book.php
@@ -66,8 +66,8 @@ class Book {
 			%s  href='%s'" . ">%s</a>
 			EOF,
 			str_repeat("\t", $indent), $this->id, $this->id,
-			str_repeat("\t", $indent), PageMeta::$book->getId()==$this->id ? " current" : "",
-			str_repeat("\t", $indent), PageMeta::$book->getId()==$this->id ? "javascript:void(0)" : $this->encodeUrl(), $this->name
+			str_repeat("\t", $indent), PageMeta::$bookId==$this->id ? " current" : "",
+			str_repeat("\t", $indent), PageMeta::$bookId==$this->id ? "javascript:void(0)" : $this->encodeUrl(), $this->name
 		);
 	}
 	
diff --git a/src/Element/BookContent/BookContented.php b/src/Element/BookContent/BookContented.php
index 2722bb6..ad73d3c 100644
--- a/src/Element/BookContent/BookContented.php
+++ b/src/Element/BookContent/BookContented.php
@@ -4,44 +4,49 @@ namespace SukWs\Bookshelf\Element\BookContent;
 
 use DOMDocument;
 use DOMNode;
-use SukWs\Bookshelf\Element\Bookshelf;
 use Exception;
 
 class BookContented {
 	
-	private string $id;
+	private string $configVersion;
+	
 	private string $name;
 	
 	private array $configurations = array();
 	
-	public function __construct (string $id, string $name) {
-		$this->id = $id;
-		$this->name = $name;
+	public function __construct (string $configVersion) {
+		$this->configVersion = $configVersion;
 	}
 	
-	private Chapter $childs;
+	private Chapter $children;
 	
 	/**
-	 * @param DOMNode $xmlData
+	 * @param DOMNode $nodeBook
 	 * @return BookContented
 	 * @throws Exception
 	 */
-	public static function parse (DOMNode $xmlData): BookContented {
-		if ($xmlData->hasAttributes() && $xmlData->hasChildNodes()) {
-			$attrName = $xmlData->attributes->getNamedItem("name");
-			$attrId = $xmlData->attributes->getNamedItem("id");
-			if ($attrName == null)
-				if ($attrId == null) throw new Exception("BookWithContent xml data missing attribute \"name\"");
-				else throw new Exception("BookWithContent xml data with id \"$attrId->nodeValue\" missing attribute \"name\"");
-			else $name = $attrName->nodeValue;
-			if ($attrId == null) throw new Exception("BookWithContent xml data named \"$name\" missing attribute \"id\"");
-			else $id = $attrId->nodeValue;
-			$node = new BookContented($id, $name);
-			$node->childs = Chapter::parse($xmlData, null);
-			Bookshelf::parseConfigurationAttr($xmlData->attributes, $node->configurations, array("name", "id"));
-		} else
-			throw new Exception("No child or attribute found on BookWithContent");
-		return $node;
+	public static function parse (DOMNode $nodeBook): BookContented {
+		$attrVersion = $nodeBook->attributes->getNamedItem("version");
+		$bookConfigVersion = $attrVersion?->nodeValue;
+		$return = new BookContented($bookConfigVersion);
+		for ($child = $nodeBook->firstChild; $child != null; $child = $child->nextSibling) {
+			switch ($child->nodeName) {
+				case "book_name":
+					if (!empty($return->name)) throw new Exception("Duplicated contents in Book.xml");
+					$return->name = $child->nodeValue;
+					break;
+				case "contents":
+					if (!empty($return->children)) throw new Exception("Duplicated contents in Book.xml");
+					$return->children = Chapter::parse($child, null);
+					break;
+				case "#comment":
+				case "#text":
+					if (empty(trim($child->nodeValue))) break;
+				default:
+					throw new Exception("Book.xml has sub-node \"$child->nodeName\" with is not supported.");
+			}
+		}
+		return $return;
 	}
 	
 	/**
@@ -49,9 +54,10 @@ class BookContented {
 	 * @return BookContented
 	 * @throws Exception
 	 */
-	public static function parseRootBook (DOMNode $rootBookNode): BookContented {
-		$return = new BookContented("%root", "");
-		$return->childs = Chapter::parse($rootBookNode, null);
+	public static function parseRootBook (DOMNode $rootBookNode, string $bookName): BookContented {
+		$return = new BookContented("2.0");
+		$return->name = $bookName;
+		$return->children = Chapter::parse($rootBookNode, null);
 		return $return;
 	}
 	
@@ -69,24 +75,24 @@ class BookContented {
 		
 	}
 	
-	public function getId (): string {
-		return $this->id;
+	public function getConfigVersion (): string {
+		return $this->configVersion;
 	}
 	
 	public function getName (): string {
 		return $this->name;
 	}
 	
-	public function getChilds (): Chapter {
-		return $this->childs;
+	public function getChildren (): Chapter {
+		return $this->children;
 	}
 	
 	public function getSummaryHtml (): string {
-		return $this->childs->getSummaryHtml();
+		return $this->children->getSummaryHtml();
 	}
 	
 	public function getPage (string $id): ?Page {
-		return $this->childs->getPage($id);
+		return $this->children->getPage($id);
 	}
 	
 	public function getConfiguration (string $key): ?string {
diff --git a/src/Element/BookContent/Chapter.php b/src/Element/BookContent/Chapter.php
index f0bb3a7..ce0e81e 100644
--- a/src/Element/BookContent/Chapter.php
+++ b/src/Element/BookContent/Chapter.php
@@ -27,7 +27,7 @@ class Chapter {
 	 * @return Chapter
 	 * @throws Exception
 	 */
-	public static function parse (DOMNode $xmlData, ?Chapter $parent): Chapter {
+	public static function parse (DOMNode $xmlData, ?Chapter $parent, ?string $idRoot = null): Chapter {
 		$child = $xmlData->firstChild;
 		if ($parent != null) {
 			while ($child->nodeName != "caption") {
@@ -44,13 +44,15 @@ class Chapter {
 			$node = new Chapter($child->nodeValue, array(), $parent);
 			$child = $child->nextSibling;
 		} else $node = new Chapter("", array(), $parent);
+		$attrRoot = $xmlData->attributes->getNamedItem("root");
+		$chapterIdRoot = $idRoot . $attrRoot?->nodeValue;
 		for (;$child != null ; $child = $child->nextSibling) {
 			switch ($child->nodeName) {
 				case "Page":
-					$node->children[] = Page::parse($child, $node);
+					$node->children[] = Page::parse($child, $node, $chapterIdRoot);
 					break;
 				case "Chapter":
-					$node->children[] = self::parse($child, $node);
+					$node->children[] = self::parse($child, $node, $chapterIdRoot);
 					break;
 				case "Separator":
 					$node->children[] = Separator::parse($child, $node);
diff --git a/src/Element/BookContent/Page.php b/src/Element/BookContent/Page.php
index c29ee0d..2d37a5e 100644
--- a/src/Element/BookContent/Page.php
+++ b/src/Element/BookContent/Page.php
@@ -28,11 +28,11 @@ class Page {
 	 * @return Page
 	 * @throws Exception
 	 */
-	public static function parse (DOMNode $pageNode, Chapter $parent): Page {
+	public static function parse (DOMNode $pageNode, Chapter $parent, ?string $idRoot): Page {
 		if ($pageNode->hasAttributes()) {
 			$attrId = $pageNode->attributes->getNamedItem("id");
 			if ($attrId == null) throw new Exception("an Page xml data missing attribute \"id\"");
-			else $id = $attrId->nodeValue;
+			else $id = $idRoot . $attrId->nodeValue;
 		} else
 			throw new Exception("Book xml data missing attributes");
 		return new Page($id, $pageNode->nodeValue, $parent);
@@ -89,12 +89,12 @@ class Page {
 	public function encodeUrl (): string {
 		return str_replace(
 			"%2F", "/",
-			sprintf("/%s/%s", urlencode(PageMeta::$book->getId()), urlencode($this->id))
+			sprintf("/%s/%s", urlencode(PageMeta::$bookId), urlencode($this->id))
 		);
 	}
 	
 	public function getContentFilename (string $type): string {
-		return sprintf("./data/%s/%s.%s", PageMeta::$book->getId(), $this->id, $type);
+		return sprintf("./data/%s/%s.%s", PageMeta::$bookId, $this->id, $type);
 	}
 	
 	public function hasContent (string $type): string {
diff --git a/src/Element/Bookshelf.php b/src/Element/Bookshelf.php
index afe5c6f..7725690 100644
--- a/src/Element/Bookshelf.php
+++ b/src/Element/Bookshelf.php
@@ -48,7 +48,7 @@ class Bookshelf {
 							$return->books = BookCollection::parse($rc, null, true);
 							break;
 						case "root_book":
-							$return->rootBook = BookContented::parseRootBook($rc);
+							$return->rootBook = BookContented::parseRootBook($rc, $return->siteName);
 							break;
 						case "configurations":
 							self::parseConfiguration($rc, $return->configurations);
diff --git a/template/footer.php b/template/footer.php
index 325ab22..f935c43 100644
--- a/template/footer.php
+++ b/template/footer.php
@@ -12,7 +12,7 @@
 		?>
 		<script><?= SiteMeta::getCustomScriptContent("custom") ?></script>
 		<script>
-			bookCurrentId = "<?= PageMeta::$book->getId() ?>";
+			bookCurrentId = "<?= PageMeta::$bookId ?>";
 			pageCurrentId = "<?= PageMeta::$page->getId() ?>";
 			<?php if (!(PageMeta::getConfigurationLevelPage(ConfigName::highlightjs)=="false")) :
 			?>hljs.highlightAll();<?php endif; ?>