don't know if it helps you but I used this way to add geojson vector layer :
var layer = new OpenLayers.Layer.GML("Uzemie s cestnou sietou",
"area_mercator.json", {
projection: new OpenLayers.Projection("EPSG:900913"),
format: OpenLayers.Format.GeoJSON,
style: {
strokeColor: "#FF0000",
strokeOpacity: 1,
strokeWidth: 2,
fillColor: "#00FF00",
fillOpacity: 0}
});
....just change some part to gml I think
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