diff --git a/lib/model-definition.js b/lib/model-definition.js
new file mode 100644
index 00000000..7a336de8
--- /dev/null
+++ b/lib/model-definition.js
@@ -0,0 +1,179 @@
+var assert = require('assert');
+var util = require('util');
+var EventEmitter = require('events').EventEmitter;
+
+/**
+ * Model definition
+ */
+module.exports = ModelDefinition;
+
+/**
+ * Constructor for ModelDefinition
+ * @param name
+ * @param properties
+ * @param settings
+ * @returns {ModelDefinition}
+ * @constructor
+ *
+ */
+function ModelDefinition(name, properties, settings) {
+    if (!(this instanceof ModelDefinition)) {
+        return new ModelDefinition(name, properties, settings);
+    }
+    assert(name, 'name is missing');
+
+    if (arguments.length === 1 && typeof name === 'object') {
+        this.name = name.name;
+        this.properties = name.properties || {};
+        this.settings = name.settings || {};
+    } else {
+        assert(typeof name === 'string', 'name must be a string');
+        this.name = name;
+        this.properties = properties || {};
+        this.settings = settings || {};
+    }
+}
+
+util.inherits(ModelDefinition, EventEmitter);
+
+/**
+ * Convert to a plain JSON Object
+ * @returns {Object}
+ */
+ModelDefinition.prototype.toJSON = function () {
+    return this;
+};
+
+/**
+ *
+ * @returns {*}
+ */
+ModelDefinition.prototype.build = function () {
+    if(this.model) {
+        return this.model;
+    }
+    return this;
+};
+
+/**
+ * Return table name for specified `modelName`
+ * @param {String} connectorType The connector type, such as 'oracle' or 'mongodb'
+ */
+ModelDefinition.prototype.tableName = function (connectorType) {
+    var settings = this.settings;
+    if(settings[connectorType]) {
+        return settings[connectorType].table || this.name;
+    } else {
+        return this.name;
+    }
+};
+
+/**
+ * Return column name for specified modelName and propertyName
+ * @param {String} connectorType The connector type, such as 'oracle' or 'mongodb'
+ * @param propertyName The property name
+ * @returns {String} columnName
+ */
+ModelDefinition.prototype.columnName = function (connectorType, propertyName) {
+    if(!propertyName) {
+        return propertyName;
+    }
+    var property = this.properties[propertyName];
+    if(property && property[connectorType]) {
+        return property[connectorType].columnName || propertyName;
+    } else {
+        return propertyName;
+    }
+};
+
+/**
+ * Return column metadata for specified modelName and propertyName
+ * @param {String} connectorType The connector type, such as 'oracle' or 'mongodb'
+ * @param propertyName The property name
+ * @returns {Object} column metadata
+ */
+ModelDefinition.prototype.columnMetadata = function (connectorType, propertyName) {
+    if(!propertyName) {
+        return propertyName;
+    }
+    var property = this.properties[propertyName];
+    if(property && property[connectorType]) {
+        return property[connectorType];
+    } else {
+        return null;
+    }
+};
+
+/**
+ * Return column names for specified modelName
+ * @param {String} connectorType The connector type, such as 'oracle' or 'mongodb'
+ * @returns {String[]} column names
+ */
+ModelDefinition.prototype.columnNames = function (connectorType) {
+    var props = this.properties;
+    var cols = [];
+    for(var p in props) {
+        if(props[p][connectorType]) {
+            cols.push(props[p][connectorType].columnName || p);
+        } else {
+            cols.push(p);
+        }
+    }
+    return cols;
+};
+
+/**
+ * Find the ID properties sorted by the index
+ * @returns {Object[]} property name/index for IDs
+ */
+ModelDefinition.prototype.ids = function () {
+    if(this.ids) {
+        return this.ids;
+    }
+    var ids = [];
+    var props = this.properties;
+    for (var key in props) {
+        var id = props[key].id;
+        if(!id) {
+            continue;
+        }
+        if(typeof id !== 'number') {
+            id = 1;
+        }
+        ids.push({name: key, id: id});
+    }
+    ids.sort(function (a, b) {
+        return a.key - b.key;
+    });
+    return ids;
+};
+
+/**
+ * Find the ID column name
+ * @param {String} modelName The model name
+ * @returns {String} columnName for ID
+ */
+ModelDefinition.prototype.idColumnName = function(connectorType) {
+    return this.columnName(connectorType, this.idName());
+};
+
+/**
+ * Find the ID property name
+ * @returns {String} property name for ID
+ */
+ModelDefinition.prototype.idName = function() {
+    var id = this.ids[0];
+    return id && id.name;
+};
+
+/**
+ * Find the ID property names sorted by the index
+ * @returns {String[]} property names for IDs
+ */
+ModelDefinition.prototype.idNames = function () {
+    var ids = this.ids;
+    var names = ids.map(function (id) {
+        return id.name;
+    });
+    return names;
+};