diff --git a/ivette/src/dome/src/renderer/data.js b/ivette/src/dome/src/renderer/data.js
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+++ b/ivette/src/dome/src/renderer/data.js
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+// --------------------------------------------------------------------------
+// --- Data Collector
+// --------------------------------------------------------------------------
+
+/** @module dome/data
+ @description
+
+This module allows to integrate data definitions within React elements.
+
+Data are collected through libraries.
+You create libraries with `createLibrary()` or `useNewLibrary()` and
+then provide them to `<Data.Item>`, `<Data.Component>`, `<Data.Node>` or
+`<Data.Fragment>` elements.
+
+At any (other) point of the tree, you can use the collected items
+with the `useLibrary()` custom React hook.
+
+Libraries are pushed down the React virtual tree _via_ React context,
+so you don't need to re-specify it for children of `<Data.Node/>`
+and `<Data.Fragment/>`.
+
+Items must be identified with a unique `id` ; they are sorted according
+to their `order` property, although `<Data.Fragment/>` and `<Data.Node/>`
+preserve the order of data collected from each of their children. Items are
+collected when they are actually _mounted_ by React,
+like any other React element.
+
+Data elements are normal React element, that might be rendered by
+visible elements in the DOM. You may think of data elements as having a
+double rendering: mounted data items are collected into libraries, and normal visible
+elements are collected into the React virtual DOM. Each kind of data element is
+rendered differenly with this respect:
+
+- `<Data.Item>` renders its children within a React fragment;
+- `<Data.Node>` is like an item, with its data children stored in the registered item;
+- `<Data.Component>` always renders 'null' and capture its React children elements in the registered item;
+- `<Data.Fragment>` renders its children within a React fragment, with optional context library and specified order.
+
+See each component for more details.
+*/
+
+import _ from 'lodash' ;
+import React from 'react';
+import Dome from 'dome' ;
+import EventEmitter from 'events' ;
+
+
+// --------------------------------------------------------------------------
+// --- Libraries
+// --------------------------------------------------------------------------
+
+const reOrder = (items) =>
+ _.sortBy( items , [ 'order','id' ] )
+ .map( (item,order) => Object.assign( item, { order } ));
+
+/**
+ @summary Data Collector.
+ @description
+ Libraries are used to collect data through the React virtual DOM.
+*/
+class Library extends EventEmitter
+{
+
+ constructor() {
+ super();
+ this.items = {};
+ }
+
+ _trigger() {
+ if (!this.triggered) {
+ this.sorted = undefined ;
+ this.triggered = true ;
+ setImmediate(() => this.emit('trigger'));
+ }
+ }
+
+ /**
+ @summary Register Item.
+ @param {object} item - must have an `'id'` property
+ */
+ add(item) {
+ const id = item.id ;
+ if (Dome.DEVEL && this.items[id])
+ console.warn(`[dome/data] duplicate item identifier (${id})`);
+ this.items[id] = item ;
+ this._trigger();
+ }
+
+ /**
+ @summary Remove Item.
+ @param {string} id - the item identifier to remove
+ */
+ remove(id) {
+ delete this.items[id];
+ this._trigger();
+ }
+
+ /**
+ @summary Bugger Contents.
+ @return {Array<object>} items array sorted by `'order'` and `'id'` properties.
+ */
+ contents() {
+ return this.sorted || (this.sorted = reOrder( this.items ));
+ }
+
+ /**
+ @summary Register callback.
+ @param {function} callback - invoked when library contents changes
+ **/
+ on(callback) { this.on('trigger',callback); }
+
+ /**
+ @summary Un-register callback.
+ @param {function} callback - callback to unregister
+ **/
+ off(callback) { this.off('trigger',callback); }
+
+}
+
+/**
+ @summary Creates a Data library.
+ @return {Library} a newly created, empty library.
+ @description
+ Same as `new Library()`.
+ */
+export function createLibrary() { return new Library(); }
+
+/**
+ @summary Collect living items from the library (Custom React Hook).
+ @param {Library} library - the desired library
+ @return {Array<items>} items currently mounted in the library
+ @description
+ This hook is automatically updated whenever an item is added or removed
+ from the library.
+ */
+export function useLibrary(library) {
+ const forceUpdate = Dome.useForceUpdate();
+ Dome.useEmitter( library , 'trigger' , forceUpdate );
+ return library.contents();
+}
+
+/**
+ @summary Use a locally created new library (Custom React Hook).
+ @return {object} `{ library, items }` the local library and its collected items
+ @description
+ This is a combination of a locally created library _and_ its collected items.
+ Same as:
+ ```
+ const library = React.useMemo( createLibrary , [] );
+ const items = useLibrary( library );
+ ```
+ */
+export function useNewLibrary() {
+ const library = React.useMemo( createLibrary , [] );
+ const items = useLibrary( library );
+ return { library , items };
+}
+
+const CurrentLib = React.createContext();
+const CurrentPath = React.createContext([]);
+
+const makePath = (path,order) =>
+ order === undefined ? path : path.slice(0,-1).concat(order);
+
+/**
+ @summary Current library (Custom React Hook).
+ @return {Library} in local context
+ */
+export function useCurrentLibrary() {
+ return React.useContext( CurrentLib );
+}
+
+// --------------------------------------------------------------------------
+// --- Internals
+// --------------------------------------------------------------------------
+
+function useLocalItem( { lib:localLib, id, order, ...itemProps }, children )
+{
+ const currentLib = React.useContext(CurrentLib);
+ const currentPath = React.useContext(CurrentPath);
+ const path = makePath( currentPath, order );
+ React.useEffect( () => {
+ const library = localLib || currentLib ;
+ if (id && library) {
+ const item = { id, order:path, ...itemProps };
+ if (children) item.children = children ;
+ library.add(item) ;
+ return () => library.remove(id);
+ } else
+ return undefined;
+ });
+ return path;
+};
+
+function makeChildren( path, children)
+{
+ const n = React.Children.count( children );
+ if (n == 0) return null;
+ else {
+ const childContext = (elt,k) => {
+ if (elt) {
+ const newPath = path.concat(1+k);
+ return (
+ <CurrentPath.Provider value={newPath}>
+ {elt}
+ </CurrentPath.Provider>
+ );
+ } else
+ return elt ;
+ };
+ return React.Children.map( children, childContext );
+ }
+}
+
+// --------------------------------------------------------------------------
+// --- Item Definition
+// --------------------------------------------------------------------------
+
+/**
+ @class
+ @summary Data Item definition.
+ @property {Library} [lib] - data library collecting the item
+ @property {string} [id] - item identifier
+ @property {number} [order] - item local ordering (default: inherited)
+ @property {any} [...props] - other item properties
+ @property {React.Children} [children] - rendered elements
+ @description
+ Register a new item in the library:
+
+ ```
+ { id, order, props }
+ ```
+
+ If not specified, the current context library is used. If no identifier nor
+ library is actually available, the item definition is skipped.
+
+ An `<Item/>` element rendres its children in a nested, ordered fragment,
+ but with the same current library than the inherited one, if any.
+*/
+export const Item = ( { children, ...props} ) => {
+ let path = useLocalItem( props );
+ return (<React.Fragment>{makeChildren(path,children)}</React.Fragment>);
+};
+
+// --------------------------------------------------------------------------
+// --- Component Definition
+// --------------------------------------------------------------------------
+
+/**
+ @class
+ @summary Data Component definition.
+ @property {Library} [lib] - data library collecting the item (default: inherited)
+ @property {string} id - item identifier (default: skip item definition)
+ @property {number} [order] - item order (default: parent fragment ordering)
+ @property {any} [...props] - registered item properties
+ @property {React.Children} [children] - component _virtual_ elements
+ @description
+ Register a new item in the library. If enabled and not disabled,
+ the collected item data will be:
+
+ ```
+ { id, order, props, children: React.Children }
+ ```
+
+ The specified order property is used to sort this item among its immediate
+ neighbours in the React virtual DOM. The final item order is determined with
+ respect to all the other collected items.
+
+ Children elements of the `<Component/>` are _not_ mounted into the React
+ virtual DOM. However, they are stored in the `children` property of the
+ item, and can be rendered in other parts of the DOM through
+ `useCurrentLibrary()` react hook. The local context will _not_ be propagated
+ to these children.
+
+ The component element itself is rendered as `null` when mounted in the virtual DOM by React.
+*/
+export const Component = ( { children, ...props} ) => {
+ useLocalItem( props, children );
+ return null;
+};
+
+// --------------------------------------------------------------------------
+// --- Node Definition
+// --------------------------------------------------------------------------
+
+/**
+ @class
+ @summary Recursive Data Item definition.
+ @property {Library} [lib] - data library collecting the item (default: inherited)
+ @property {string} id - item identifier (default: skip item definition)
+ @property {number} [order] - item order (default: parent fragment ordering)
+ @property {any} [...props] - registered item properties
+ @property {React.Children} [children] - sub-data and rendering of the item
+ @description
+ Register a new item in the library, as follows:
+
+ ```
+ { id, order, props, children: Array<item> }
+ ```
+
+ The specified order property is used to sort this item among its immediate
+ neighbours in the React virtual DOM. The final item order is determined with
+ respect to all the other collected items.
+
+ A _new_ local library is created and associated to this `<Node/>` element, and propagated
+ in children as the new context library. If necessary, you can obtain this local
+ library with the `useContext()` react hook.
+
+ Hence, children elements of the node item _are_ rendered in the virtual React DOM,
+ but their data elements are collected and stored in the `children` property of the
+ defined `<Node/>` item.
+*/
+export const Node = ({ children, ...props }) => {
+ let { library, items } = useNewLibrary();
+ let path = useLocalItem( props , items );
+ return (
+ <CurrentLib.Provider value={library}>
+ {makeChildren( path, children )}
+ </CurrentLib.Provider>
+ );
+};
+
+// --------------------------------------------------------------------------
+// --- Fragment Definition
+// --------------------------------------------------------------------------
+
+/**
+ @class
+ @summary Ordered Data Collection.
+ @property {Library} [lib] - local library to use
+ @property {Sortable} [order] - local order to use (default: inherited)
+ @property {boolean} [enabled] - fragment shall be rendered (default: `true`)
+ @property {boolean} [disabled] - fragment shal not be rendered (default: `false`)
+ @property {React.Children} [children] - sub-data and rendering of the data collection
+ */
+export const Fragment = ({lib:localLib, order, enabled=true, disabled=false, children, ...localProps}) => {
+ const currentLib = React.useContext(CurrentLib);
+ const currentPath = React.useContext(CurrentPath);
+ const library = localLib || currentLib ;
+ if ( enabled && !disabled && React.Children.count(children) > 0 )
+ {
+ const path = makePath( currentPath, order );
+ return (
+ <CurrentLib.Provider value={library}>
+ {makeChildren( path, children )}
+ </CurrentLib.Provider>
+ );
+ } else
+ return null;
+};
+
+// --------------------------------------------------------------------------
+// --- Exports
+// --------------------------------------------------------------------------
+
+export default {
+ Library,
+ createLibrary, useLibrary,
+ useCurrentLibrary, useNewLibrary,
+ Item, Component, Node, Fragment
+};
+
+// --------------------------------------------------------------------------