--- a/labs/openlayers/lib/OpenLayers/Format/Context.js
+++ b/labs/openlayers/lib/OpenLayers/Format/Context.js
@@ -1,1 +1,335 @@
-
+/* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for 
+ * full list of contributors). Published under the Clear BSD license.  
+ * See http://svn.openlayers.org/trunk/openlayers/license.txt for the
+ * full text of the license. */
+
+/**
+ * @requires OpenLayers/Format/XML.js
+ */
+
+/**
+ * Class: OpenLayers.Format.Context
+ * Base class for both Format.WMC and Format.OWSContext
+ */
+OpenLayers.Format.Context = OpenLayers.Class({
+
+    /**
+     * APIProperty: version
+     * {String} Specify a version string if one is known.
+     */
+    version: null,
+
+    /**
+     * Property: layerOptions
+     * {Object} Default options for layers created by the parser. These
+     *     options are overridden by the options which are read from the
+     *     capabilities document.
+     */
+    layerOptions: null,
+
+    /**
+     * Property: layerParams
+     * {Object} Default parameters for layers created by the parser. This
+     *     can be used e.g. to override DEFAULT_PARAMS for 
+     *     OpenLayers.Layer.WMS.
+     */
+    layerParams: null,
+
+    /**
+     * Property: parser
+     * {Object} Instance of the versioned parser.  Cached for multiple read and
+     *     write calls of the same version.
+     */
+    parser: null,
+
+    /**
+     * Constructor: OpenLayers.Format.Context
+     * Create a new parser for Context documents.
+     *
+     * Parameters:
+     * options - {Object} An optional object whose properties will be set on
+     *     this instance.
+     */
+    initialize: function(options) {
+        OpenLayers.Util.extend(this, options);
+        this.options = options;
+    },
+
+    /**
+     * APIMethod: read
+     * Read Context data from a string, and return an object with map
+     *     properties and a list of layers.
+     *
+     * Parameters:
+     * data - {String} or {DOMElement} data to read/parse.
+     * options - {Object} The options object must contain a map property.  If
+     *     the map property is a string, it must be the id of a dom element
+     *     where the new map will be placed.  If the map property is an
+     *     <OpenLayers.Map>, the layers from the context document will be added
+     *     to the map.
+     *
+     * Returns:
+     * {<OpenLayers.Map>} A map based on the context.
+     */
+    read: function(data, options) {
+        if(typeof data == "string") {
+            data = OpenLayers.Format.XML.prototype.read.apply(this, [data]);
+        }
+        var root = data.documentElement;
+        var version = this.version;
+        if(!version) {
+            version = root.getAttribute("version");
+        }
+        var parser = this.getParser(version);
+        var context = parser.read(data, options);
+        var map;
+        if(options && options.map) {
+            this.context = context;
+            if(options.map instanceof OpenLayers.Map) {
+                map = this.mergeContextToMap(context, options.map);
+            } else {
+                var mapOptions = options.map;
+                if(OpenLayers.Util.isElement(mapOptions) ||
+                   typeof mapOptions == "string") {
+                    // we assume mapOptions references a div
+                    // element
+                    mapOptions = {div: mapOptions};
+                }
+                map = this.contextToMap(context, mapOptions);
+            }
+        } else {
+            // not documented as part of the API, provided as a non-API option
+            map = context;
+        }
+        return map;
+    },
+
+    /**
+     * Method: getLayerFromContext
+     * Create a WMS layer from a layerContext object.
+     *
+     * Parameters:
+     * layerContext - {Object} An object representing a WMS layer.
+     *
+     * Returns:
+     * {<OpenLayers.Layer.WMS>} A WMS layer.
+     */
+    getLayerFromContext: function(layerContext) {
+        var i, len;
+        // fill initial options object from layerContext
+        var options = {
+            queryable: layerContext.queryable, //keep queryable for api compatibility
+            visibility: layerContext.visibility,
+            maxExtent: layerContext.maxExtent,
+            metadata: OpenLayers.Util.applyDefaults(layerContext.metadata, 
+                {styles: layerContext.styles}),
+            numZoomLevels: layerContext.numZoomLevels,
+            units: layerContext.units,
+            isBaseLayer: layerContext.isBaseLayer,
+            opacity: layerContext.opacity,
+            displayInLayerSwitcher: layerContext.displayInLayerSwitcher,
+            singleTile: layerContext.singleTile,
+            tileSize: (layerContext.tileSize) ? 
+                new OpenLayers.Size(
+                    layerContext.tileSize.width, 
+                    layerContext.tileSize.height
+                ) : undefined,
+            minScale: layerContext.minScale || layerContext.maxScaleDenominator,
+            maxScale: layerContext.maxScale || layerContext.minScaleDenominator
+        };
+        if (this.layerOptions) {
+            OpenLayers.Util.applyDefaults(options, this.layerOptions);
+        }
+
+        var params = {
+            layers: layerContext.name,
+            transparent: layerContext.transparent,
+            version: layerContext.version
+        };
+        if (layerContext.formats && layerContext.formats.length>0) {
+            // set default value for params if current attribute is not positionned
+            params.format = layerContext.formats[0].value;
+            for (i=0, len=layerContext.formats.length; i<len; i++) {
+                var format = layerContext.formats[i];
+                if (format.current == true) {
+                    params.format = format.value;
+                    break;
+                }
+            }
+        }
+        if (layerContext.styles && layerContext.styles.length>0) {
+            for (i=0, len=layerContext.styles.length; i<len; i++) {
+                var style = layerContext.styles[i];
+                if (style.current == true) {
+                    // three style types to consider
+                    // 1) linked SLD
+                    // 2) inline SLD
+                    // 3) named style
+                    if(style.href) {
+                        params.sld = style.href;
+                    } else if(style.body) {
+                        params.sld_body = style.body;
+                    } else {
+                        params.styles = style.name;
+                    }
+                    break;
+                }
+            }
+        }
+        if (this.layerParams) {
+            OpenLayers.Util.applyDefaults(params, this.layerParams);
+        }
+
+        var layer = null;
+        var service = layerContext.service;
+        if (service == OpenLayers.Format.Context.serviceTypes.WFS) {
+            options.strategies = [new OpenLayers.Strategy.BBOX()];
+            options.protocol = new OpenLayers.Protocol.WFS({
+                url: layerContext.url,
+                // since we do not know featureNS, let the protocol
+                // determine it automagically using featurePrefix
+                featurePrefix: layerContext.name.split(":")[0],
+                featureType: layerContext.name.split(":").pop()
+            });
+            layer = new OpenLayers.Layer.Vector(
+                layerContext.title || layerContext.name,
+                options
+            );
+        } else if (service == OpenLayers.Format.Context.serviceTypes.KML) {
+            // use a vector layer with an HTTP Protcol and a Fixed strategy
+            options.strategies = [new OpenLayers.Strategy.Fixed()];
+            options.protocol = new OpenLayers.Protocol.HTTP({
+                url: layerContext.url, 
+                format: new OpenLayers.Format.KML()
+            });
+            layer = new OpenLayers.Layer.Vector(
+                layerContext.title || layerContext.name,
+                options
+            );
+        } else if (service == OpenLayers.Format.Context.serviceTypes.GML) {
+            // use a vector layer with a HTTP Protocol and a Fixed strategy
+            options.strategies = [new OpenLayers.Strategy.Fixed()];
+            options.protocol = new OpenLayers.Protocol.HTTP({
+                url: layerContext.url, 
+                format: new OpenLayers.Format.GML()
+            });
+            layer = new OpenLayers.Layer.Vector(
+                layerContext.title || layerContext.name,
+                options
+            );
+        } else if (layerContext.features) {
+            // inline GML or KML features
+            layer = new OpenLayers.Layer.Vector(
+                layerContext.title || layerContext.name,
+                options
+            );
+            layer.addFeatures(layerContext.features);
+        } else if (layerContext.categoryLayer !== true) {
+            layer = new OpenLayers.Layer.WMS(
+                layerContext.title || layerContext.name,
+                layerContext.url,
+                params,
+                options
+            );
+        }
+        return layer;
+    },
+
+    /**
+     * Method: getLayersFromContext
+     * Create an array of layers from an array of layerContext objects.
+     *
+     * Parameters:
+     * layersContext - {Array(Object)} An array of objects representing layers.
+     *
+     * Returns:
+     * {Array(<OpenLayers.Layer>)} An array of layers.
+     */
+    getLayersFromContext: function(layersContext) {
+        var layers = [];
+        for (var i=0, len=layersContext.length; i<len; i++) {
+            var layer = this.getLayerFromContext(layersContext[i]);
+            if (layer !== null) {
+                layers.push(layer);
+            }
+        }
+        return layers;
+    },
+
+    /**
+     * Method: contextToMap
+     * Create a map given a context object.
+     *
+     * Parameters:
+     * context - {Object} The context object.
+     * options - {Object} Default map options.
+     *
+     * Returns:
+     * {<OpenLayers.Map>} A map based on the context object.
+     */
+    contextToMap: function(context, options) {
+        options = OpenLayers.Util.applyDefaults({
+            maxExtent: context.maxExtent,
+            projection: context.projection
+        }, options);
+        var map = new OpenLayers.Map(options);
+        map.addLayers(this.getLayersFromContext(context.layersContext));
+        map.setCenter(
+            context.bounds.getCenterLonLat(),
+            map.getZoomForExtent(context.bounds, true)
+        );
+        return map;
+    },
+
+    /**
+     * Method: mergeContextToMap
+     * Add layers from a context object to a map.
+     *
+     * Parameters:
+     * context - {Object} The context object.
+     * map - {<OpenLayers.Map>} The map.
+     *
+     * Returns:
+     * {<OpenLayers.Map>} The same map with layers added.
+     */
+    mergeContextToMap: function(context, map) {
+        map.addLayers(this.getLayersFromContext(context.layersContext));
+        return map;
+    },
+
+    /**
+     * APIMethod: write
+     * Write a context document given a map.
+     *
+     * Parameters:
+     * obj - {<OpenLayers.Map> | Object} A map or context object.
+     * options - {Object} Optional configuration object.
+     *
+     * Returns:
+     * {String} A context document string.
+     */
+    write: function(obj, options) {
+        obj = this.toContext(obj);
+        var version = options && options.version;
+        var parser = this.getParser(version);
+        var context = parser.write(obj, options);
+        return context;
+    },
+
+    CLASS_NAME: "OpenLayers.Format.Context"
+});
+
+/**
+ * Constant: OpenLayers.Format.Context.serviceTypes
+ * Enumeration for service types
+ */
+OpenLayers.Format.Context.serviceTypes = {
+    "WMS": "urn:ogc:serviceType:WMS",
+    "WFS": "urn:ogc:serviceType:WFS",
+    "WCS": "urn:ogc:serviceType:WCS",
+    "GML": "urn:ogc:serviceType:GML",
+    "SLD": "urn:ogc:serviceType:SLD",
+    "FES": "urn:ogc:serviceType:FES",
+    "KML": "urn:ogc:serviceType:KML"
+};
+