Node-RED block in Snap4City Microservice library node-red-contrib-snap4city-user is "bus-routes-search-within-polygon">
    <p>It provides a list of the public transport routes that have a stop in a specified area.
    </p>

    <h3>Inputs</h3>
    A JSON with these parameters:

    <dl class="message-properties">
        <dt>Polygon
            <span class="property-type">string</span>
        </dt>
        <dd> “&lt;wktarea>” for a geographic area described as Well Known Text </dd>
        <dt>agency
            <span class="property-type">string</span>
        </dt>
        <dd> URI of an agency to restrict the search to a specified agency
        </dd>
        <dt>maxresults
            <span class="property-type">number</span>
        </dt>
        <dd> maximum number of results to be returned (if parameter is missing 100 is assumed), if it is 0 all results are returned</dd>
    </dl>

    <h3>Outputs</h3>
    <dl class="message-properties">
        <dd> It provides a JSON Object with all the routes that have stops on the specified area. For each route the following
            properties are provided: • lineNumber: the line short name • lineName: the line long name • route: the route
            name • routeUri: an URI identifying the route (it can be used to retrieve all the stops of the route) • direction:
            with first and last stop • agency: with agency name • agencyUri: with agency URI • polyline: with the WKT geometry
            of the route</dd>
    </dl>

    <h3>Details</h3>
    <p>The node can receive a JSON with the parameters described in the Inputs section and with them generate the output JSON.
        If the values are not present in the input JSON, these are read by those in the configuration. If they are not present
        in either part, an error is generated for the necessary parameters.</p>