diff --git a/packages/cmf/__tests__/expressions/index.test.js b/packages/cmf/__tests__/expressions/index.test.js
new file mode 100644
index 0000000000..0877293cda
--- /dev/null
+++ b/packages/cmf/__tests__/expressions/index.test.js
@@ -0,0 +1,56 @@
+import Immutable from 'immutable';
+import expressions from '../../src/expressions';
+import mock from '../../src/mock';
+
+describe('expressions', () => {
+	it('should export some expressions', () => {
+		expect(expressions['cmf.collections.get']).toBeDefined();
+		expect(expressions['cmf.components.get']).toBeDefined();
+	});
+	describe('cmf.collections.get', () => {
+		it('should get collection content', () => {
+			const context = mock.context();
+			const state = mock.state();
+			state.cmf.collections = new Immutable.Map({
+				article: new Immutable.Map({
+					title: 'my title',
+				}),
+			});
+			context.store.getState = () => state;
+			expect(expressions['cmf.collections.get']({ context }, 'article.title', 'no title'))
+				.toBe('my title');
+		});
+		it('should return default value if collection doesn\'t exists', () => {
+			const context = mock.context();
+			const state = mock.state();
+			context.store.getState = () => state;
+			state.cmf.collections = new Immutable.Map({});
+			expect(expressions['cmf.collections.get']({ context }, 'article.title', 'no title'))
+				.toBe('no title');
+		});
+	});
+	describe('cmf.components.get', () => {
+		it('should get component state', () => {
+			const context = mock.context();
+			const state = mock.state();
+			state.cmf.components = new Immutable.Map({
+				MyComponent: new Immutable.Map({
+					default: new Immutable.Map({
+						show: true,
+					}),
+				}),
+			});
+			context.store.getState = () => state;
+			expect(expressions['cmf.components.get']({ context }, 'MyComponent.default.show', false))
+				.toBe(true);
+		});
+		it('should return default value if no component state', () => {
+			const context = mock.context();
+			const state = mock.state();
+			state.cmf.components = new Immutable.Map({});
+			context.store.getState = () => state;
+			expect(expressions['cmf.components.get']({ context }, 'MyComponent.default.show', false))
+				.toBe(false);
+		});
+	});
+});
diff --git a/packages/cmf/src/api.js b/packages/cmf/src/api.js
index 32d4c3c0bb..a6f55ca8d1 100644
--- a/packages/cmf/src/api.js
+++ b/packages/cmf/src/api.js
@@ -27,6 +27,7 @@ import action from './action';
 import actions from './actions';
 import actionCreator from './actionCreator';
 import expression from './expression';
+import expressions from './expressions';
 import sagas from './sagas';
 import selectors from './selectors';
 import component from './component';
@@ -42,6 +43,7 @@ export default {
 	actionCreator,
 	component,
 	expression,
+	expressions,
 	route,
 	registry,
 	registerInternals,
diff --git a/packages/cmf/src/api.md b/packages/cmf/src/api.md
index 14cefbdf72..1170188b1e 100644
--- a/packages/cmf/src/api.md
+++ b/packages/cmf/src/api.md
@@ -1,5 +1,5 @@
-CMF API
-==
+# CMF API
+
 
 ```javascript
 import { api } from '@talend/react-cmf';
@@ -15,13 +15,11 @@ Here is the list of the first level access:
 * `expression` to register your expressions
 * `saga` to use CMF with redux-saga
 
-api.actionCreator
---
+## api.actionCreator
 
 Documentation can be found [here](actionCreator.md).
 
-api.actions
---
+## api.actions
 
 ```javascript
 import { api, cmfConnect } from '@talend/react-cmf';
@@ -75,8 +73,8 @@ function mapStateToProps(state) {
 export default cmfConnect({})(MyCollectionmanager);
 ```
 
-api.component
---
+
+## api.component
 
 ```javascript
 import * as components from '@talend/containers';
@@ -88,8 +86,7 @@ api.component.registerMany({
 });
 ```
 
-api.expression
---
+## api.expression
 
 ```javascript
 function myExpression({ context, payload}, ...args) {
@@ -103,8 +100,10 @@ api.expressions.register('myExpression', myExpression);
 Expressions can be used for props resolution.
 In this case, the payload is the current props.
 
-api.sagas
---
+
+## [api.expressions](./expressions/index.md)
+
+## api.saga
 
 You can register your saga in the cmf registry to be able to use the saga props
 supported by `cmfConnect`.
diff --git a/packages/cmf/src/expressions/getInState.js b/packages/cmf/src/expressions/getInState.js
new file mode 100644
index 0000000000..67eadc66f2
--- /dev/null
+++ b/packages/cmf/src/expressions/getInState.js
@@ -0,0 +1,12 @@
+import _get from 'lodash/get';
+import Immutable from 'immutable';
+import curry from 'lodash/curry';
+
+function getInState(statePath, { context }, immutablePath, defaultValue) {
+	return _get(context.store.getState(), statePath, new Immutable.Map()).getIn(
+		immutablePath.split('.'),
+		defaultValue,
+	);
+}
+
+export default curry(getInState);
diff --git a/packages/cmf/src/expressions/index.js b/packages/cmf/src/expressions/index.js
new file mode 100644
index 0000000000..f10631aca7
--- /dev/null
+++ b/packages/cmf/src/expressions/index.js
@@ -0,0 +1,6 @@
+import getInState from './getInState';
+
+export default {
+	'cmf.collections.get': getInState('cmf.collections'),
+	'cmf.components.get': getInState('cmf.components'),
+};
diff --git a/packages/cmf/src/expressions/index.md b/packages/cmf/src/expressions/index.md
new file mode 100644
index 0000000000..e0e5e6b673
--- /dev/null
+++ b/packages/cmf/src/expressions/index.md
@@ -0,0 +1,91 @@
+# CMF Expressions
+
+## setup
+
+you have to do the following in your configure.js to activate this
+
+```javascript
+import { api } from '@talend/react-cmf';
+
+api.registerInternals();
+```
+
+Then you can use all internal expressions.
+For all the following example we take this component as example:
+
+
+```javascript
+import React from 'react';
+import PropTypes from 'prop-types';
+import Immutable from 'immutable';
+import { api, cmfConnect } from '@talend/react-cmf';
+
+const DEFAULT_STATE = new Immutable.Map({
+	like: false,
+});
+
+class Article extends React.Component {
+	static propTypes = {
+		...cmfConnect.propsTypes,
+		title: PropTypes.string,
+		description: PropTypes.string,
+	}
+	constructor(props) {
+		super(props);
+		this.onLike = this.onLike.bind(this);
+	}
+
+	onLike() {
+		this.props.setState({ like: !this.props.state.get('like') });
+	}
+
+	render() {
+		const like = this.props.state.get('like');
+			return (
+			<article>
+				<h1>{props.title}</h1>
+				<p>{props.description}</h1>
+				<button onClick={this.onLike}>{like ? 'unlike': 'like'}</button>
+			</article>
+		);
+	}
+}
+function mapStateToProps(state) {
+	return {
+		model: state.cmf.collections.get('article');
+	};
+}
+export api.cmfConnect({mapStateToProps})(MyComponent)
+```
+
+## cmf.collections
+
+```json
+	"props": {
+		"MyArticle#default": {
+			"titleExpression": {
+				"id": "cmf.collections.get",
+				"args": ["article.label", "no title"]
+			},
+			"descriptionExpression": {
+				"id": "cmf.collections.get",
+				"args": ["article.meta.description", "no description"]
+			},
+		}
+	}
+```
+
+## cmf.components
+
+let say you want to know the state of component
+
+```json
+	"props": {
+		"AnOtherComponent#default": {
+			"active": {
+				"id": "cmf.components.get",
+				"args": ["MyArticle.default.like", false]
+			}
+		}
+	}
+```