diff --git a/db_schema/db_schema.pdf b/db_schema/db_schema.pdf
new file mode 100644
index 0000000..c158807
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diff --git a/db_schema/db_schema.png b/db_schema/db_schema.png
new file mode 100644
index 0000000..b6befc6
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diff --git a/db_schema/db_schema.sql b/db_schema/db_schema.sql
new file mode 100644
index 0000000..78ef29b
--- /dev/null
+++ b/db_schema/db_schema.sql
@@ -0,0 +1,153 @@
+-- MySQL Script generated by MySQL Workbench
+-- Thu Jan 16 23:41:59 2020
+-- Model: New Model    Version: 1.0
+-- MySQL Workbench Forward Engineering
+
+SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0;
+SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
+SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';
+
+-- -----------------------------------------------------
+-- Schema bitext-aligner
+-- -----------------------------------------------------
+DROP SCHEMA IF EXISTS `bitext-aligner` ;
+
+-- -----------------------------------------------------
+-- Schema bitext-aligner
+-- -----------------------------------------------------
+CREATE SCHEMA IF NOT EXISTS `bitext-aligner` DEFAULT CHARACTER SET utf8 ;
+USE `bitext-aligner` ;
+
+-- -----------------------------------------------------
+-- Table `bitext-aligner`.`dim_author`
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS `bitext-aligner`.`dim_author` (
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `name` VARCHAR(90) NOT NULL,
+  `total_books` INT UNSIGNED NOT NULL,
+  PRIMARY KEY (`id`))
+ENGINE = InnoDB;
+
+
+-- -----------------------------------------------------
+-- Table `bitext-aligner`.`dim_book`
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS `bitext-aligner`.`dim_book` (
+  `id` INT NOT NULL,
+  `code` VARCHAR(90) NOT NULL,
+  PRIMARY KEY (`id`))
+ENGINE = InnoDB;
+
+
+-- -----------------------------------------------------
+-- Table `bitext-aligner`.`dim_book_info`
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS `bitext-aligner`.`dim_book_info` (
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `title` VARCHAR(90) NOT NULL,
+  `description` VARCHAR(200) NULL,
+  `lang` VARCHAR(5) NOT NULL,
+  `source` VARCHAR(90) NOT NULL,
+  `is_translation` TINYINT NOT NULL,
+  `total_chapters` INT UNSIGNED NOT NULL,
+  `isbn` VARCHAR(80) NULL,
+  `book` INT NOT NULL,
+  PRIMARY KEY (`id`),
+  CONSTRAINT `info_book_fk`
+    FOREIGN KEY (`book`)
+    REFERENCES `bitext-aligner`.`dim_book` (`id`)
+    ON DELETE NO ACTION
+    ON UPDATE NO ACTION)
+ENGINE = InnoDB;
+
+CREATE INDEX `book_fk_idx` ON `bitext-aligner`.`dim_book_info` (`book` ASC) VISIBLE;
+
+CREATE UNIQUE INDEX `book_UNIQUE` ON `bitext-aligner`.`dim_book_info` (`book` ASC) VISIBLE;
+
+CREATE UNIQUE INDEX `id_UNIQUE` ON `bitext-aligner`.`dim_book_info` (`id` ASC) VISIBLE;
+
+
+-- -----------------------------------------------------
+-- Table `bitext-aligner`.`dim_book_content`
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS `bitext-aligner`.`dim_book_content` (
+  `id` INT NOT NULL,
+  `book` INT NOT NULL,
+  PRIMARY KEY (`id`),
+  CONSTRAINT `content_book_fk`
+    FOREIGN KEY (`book`)
+    REFERENCES `bitext-aligner`.`dim_book` (`id`)
+    ON DELETE CASCADE
+    ON UPDATE CASCADE)
+ENGINE = InnoDB;
+
+CREATE INDEX `book_fk_idx` ON `bitext-aligner`.`dim_book_content` (`book` ASC) VISIBLE;
+
+CREATE UNIQUE INDEX `book_UNIQUE` ON `bitext-aligner`.`dim_book_content` (`book` ASC) VISIBLE;
+
+
+-- -----------------------------------------------------
+-- Table `bitext-aligner`.`dim_book_chapter`
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS `bitext-aligner`.`dim_book_chapter` (
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `c_num` INT UNSIGNED NOT NULL,
+  `name` VARCHAR(90) NULL,
+  `book_content` INT NOT NULL,
+  PRIMARY KEY (`id`),
+  CONSTRAINT `ch_content_fk`
+    FOREIGN KEY (`book_content`)
+    REFERENCES `bitext-aligner`.`dim_book_content` (`id`)
+    ON DELETE CASCADE
+    ON UPDATE CASCADE)
+ENGINE = InnoDB;
+
+CREATE INDEX `content_fk_idx` ON `bitext-aligner`.`dim_book_chapter` (`book_content` ASC) VISIBLE;
+
+
+-- -----------------------------------------------------
+-- Table `bitext-aligner`.`dim_book_sentence`
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS `bitext-aligner`.`dim_book_sentence` (
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `s_num` INT UNSIGNED NOT NULL,
+  `text` VARCHAR(500) NOT NULL,
+  `chapter` INT NOT NULL,
+  PRIMARY KEY (`id`),
+  CONSTRAINT `sen_chapter_fk`
+    FOREIGN KEY (`chapter`)
+    REFERENCES `bitext-aligner`.`dim_book_chapter` (`id`)
+    ON DELETE CASCADE
+    ON UPDATE CASCADE)
+ENGINE = InnoDB;
+
+CREATE INDEX `chapter_fk_idx` ON `bitext-aligner`.`dim_book_sentence` (`chapter` ASC) VISIBLE;
+
+
+-- -----------------------------------------------------
+-- Table `bitext-aligner`.`map_book_author`
+-- -----------------------------------------------------
+CREATE TABLE IF NOT EXISTS `bitext-aligner`.`map_book_author` (
+  `author` INT NOT NULL,
+  `book` INT NOT NULL,
+  `translator` TINYINT NOT NULL,
+  CONSTRAINT `map_book_fk`
+    FOREIGN KEY (`book`)
+    REFERENCES `bitext-aligner`.`dim_book_info` (`id`)
+    ON DELETE CASCADE
+    ON UPDATE CASCADE,
+  CONSTRAINT `map_author_fk`
+    FOREIGN KEY (`author`)
+    REFERENCES `bitext-aligner`.`dim_author` (`id`)
+    ON DELETE CASCADE
+    ON UPDATE CASCADE)
+ENGINE = InnoDB;
+
+CREATE INDEX `book_fk_idx` ON `bitext-aligner`.`map_book_author` (`book` ASC) VISIBLE;
+
+CREATE INDEX `author_fk_idx` ON `bitext-aligner`.`map_book_author` (`author` ASC) VISIBLE;
+
+
+SET SQL_MODE=@OLD_SQL_MODE;
+SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS;
+SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS;
diff --git a/xml_files/book_structure.xml b/xml_files/book_structure.xml
index 5dbade6..18d93d4 100644
--- a/xml_files/book_structure.xml
+++ b/xml_files/book_structure.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<book id="abc_book">
+<book code="abc_book">
     <bookInfo>
         <title>Crime and Punishment</title>
-        <description>
+        <description> <!--Optional-->
             Crime and Punishment (Russian: Преступление и наказание) is a novel written by Russian author Fyodor Dostoevsky.
             First published in a journal named The Russian Messenger, it appeared in twelve monthly installments in 1866, and was later published as a novel.
         </description>
@@ -12,15 +12,15 @@
         <source>https://en.wikisource.org/wiki/Crime_and_Punishment</source>
         <isTranslation>true</isTranslation>
         <totalChapters>2</totalChapters>
-        <isbn>n.a.</isbn>
+        <isbn>n.a.</isbn> <!--Optional-->
     </bookInfo>
     <content>
-        <chapter id="1" name="Erstes Kapitel">
+        <chapter num="1" name="Erstes Kapitel">
             <sentence num="1">First Sentence</sentence>
             <sentence num="2">Second Sentence</sentence>
             <sentence num="3">Third Sentence</sentence>
         </chapter>
-        <chapter id="2" name="Chapter 2">
+        <chapter num="2" name="Chapter 2">
             <sentence num="1">First Sentence</sentence>
             <sentence num="2">Second Sentence</sentence>
             <sentence num="3">Third Sentence</sentence>
diff --git a/xml_parser/create_xml.py b/xml_parser/create_xml.py
index 16ce2a7..4109a5d 100644
--- a/xml_parser/create_xml.py
+++ b/xml_parser/create_xml.py
@@ -7,7 +7,7 @@ from pathlib import Path
 
 def create_xml_file(book_dict, book_metadata):
     book_root = ET.Element('book')
-    book_root.set('id', book_metadata['book_id'])
+    book_root.set('code', book_metadata['book_id'])
 
     book_info = ET.SubElement(book_root, 'bookInfo')
     content = ET.SubElement(book_root, 'content')
@@ -45,7 +45,7 @@ def create_xml_file(book_dict, book_metadata):
 
     for key in book_dict.keys():
         chapter = ET.SubElement(content, 'chapter')
-        chapter.set('id', str(key))
+        chapter.set('num', str(key))
         for idx, val in enumerate(book_dict[key]):
             sentence = ET.SubElement(chapter, 'sentence')
             sentence.set('id', str(idx + 1))