Node-RED block in Snap4City Microservice library node-red-contrib-snap4city-user is "value-type-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>valuetype
            <span class="property-type">string</span>
        </dt>
        <dd> the value type registered by sensors that are searched
        </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>
    <ol class="node-ports">
        <li>ServiceUri Array
            <dl class="message-properties">
                <dd> Returns an array containing the servicesUri of each service found</dd>
            </dl>
        </li>
        <li> All services together
            <dl class="message-properties">
                <dd> It returns the services merge in Results section</dd>
            </dl>
        </li>
    </ol>

    <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>