Changing the balloon content template.

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Templates allow you to make custom HTML representations of geo objects, balloons, and hints.

To define a template, use the repr:Representation element, which contains the HTML code (the template body) in the repr:text container.

For more information about templates, see the documentation. 

<!DOCTYPE html>
<html>
    <head>
        <title>
            YMapsML examples. Changing the balloon content template.
        </title>
        <meta
            http-equiv="Content-Type"
            content="text/html; charset=UTF-8"
        />
        <!--
        Set your own API-key. Testing key is not valid for other web-sites and services.
        Get your API-key on the Developer Dashboard: https://developer.tech.yandex.ru/keys/
    -->
        <script
            src="https://api-maps.yandex.ru/2.1/?lang=en_RU&amp;apikey=<your API-key>"
            type="text/javascript"
        ></script>
        <script
            src="ymapsml_ballooncontentstyle.js"
            type="text/javascript"
        ></script>
        <style>
            html,
            body,
            #map {
                width: 100%;
                height: 100%;
                padding: 0;
                margin: 0;
            }
        </style>
    </head>
    <body>
        <div id="map"></div>
    </body>
</html>

ymaps.ready(init);

function init() {
    // Creating an instance of the map.
    var myMap = new ymaps.Map(
        "map",
        {
            center: [55.76, 37.64],
            zoom: 10,
        },
        {
            searchControlProvider: "yandex#search",
        }
    );

    // Loading a YMapsML file.
    ymaps.geoXml.load("data.xml").then(
        function (res) {
            // Adding geo objects to the map.
            myMap.geoObjects.add(res.geoObjects);
            // Called if loading the YMapsML file was unsuccessful.
        },
        function (error) {
            alert("Error: " + error);
        }
    );
}