function walkKmlDom(rootObject, visitCallback, options) {
    options = options || {};

    if (!('features' in options)) {
        options.features = true;
    }

    if (!('geometries' in options)) {
        options.geometries = false;
    }

    var recurse_ = function(object, currentContext) {
        var contextArgument = {
            current: currentContext,
            child: currentContext,
            walkChildren: true
        };

        // walk object
        var retValue = visitCallback.call(object, contextArgument);
        if (!retValue && typeof retValue !== 'undefined') {
            return false;
        }

        if (!contextArgument.walkChildren) {
            return true;
        }

        var objectContainer = null; // GESchemaObjectContainer

        // check if object is a parent
        if ('getFeatures' in object) { // GEFeatureContainer
            if (options.features) {
                objectContainer = object.getFeatures();
            }
        } else if ('getGeometry' in object) { // KmlFeature - descend into geoms.
            if (options.geometries && object.getGeometry()) {
                recurse_(object.getGeometry(), contextArgument.child);
            }
        } else if ('getGeometries' in object) { // GEGeometryContainer
            if (options.geometries) {
                objectContainer = object.getGeometries();
            }
        } else if ('getInnerBoundaries' in object) { // GELinearRingContainer
            if (options.geometries) {
                objectContainer = object.getInnerBoundaries();
            }
        }

        // iterate through children if object is a parent and recurse so they
        // can be walked
        if (objectContainer && objectContainer.hasChildNodes()) {
            var childNodes = objectContainer.getChildNodes();
            var numChildNodes = childNodes.getLength();

            for (var i = 0; i < numChildNodes; i++) {
                var child = childNodes.item(i);

                if (!recurse_(child, contextArgument.child))
                    return false;
            }
        }

        return true;
    };

    recurse_(rootObject, options.rootContext);
};