Fetch value from inside an attribute

Here is an html from one of the webpages i am parsing

<section class="property-header
                         " data-locale="de-DE" data-campsite-data="{&quot;id&quot;:2645,&quot;property_id&quot;:2645,&quot;property_name&quot;:&quot;Erzgebirgscamp Neuclausnitz&quot;,&quot;premium&quot;:false,&quot;amenities&quot;:&quot;[\&quot;WiFi\&quot;, \&quot;Free WiFi\&quot;]&quot;,&quot;activities&quot;:&quot;[\&quot;Cycle tracks\&quot;,\&quot;Hiking\&quot;,\&quot;Playground\&quot;,\&quot;Soccer\&quot;,\&quot;Mountainbiking\&quot;,\&quot;Cross-country skiing\&quot;]&quot;,&quot;leisure&quot;:&quot;[\&quot;Washing-up area\&quot;,\&quot;Washing machines\&quot;,\&quot;Tumble dryer\&quot;,\&quot;Washbasins\&quot;,\&quot;Shower cubicles\&quot;,\&quot;Heated sanitary facilities\&quot;,\&quot;Shared barbecueing area\&quot;,\&quot;Bread delivery\&quot;]&quot;,&quot;utilities&quot;:&quot;[\&quot;Guest boat moorings\&quot;,\&quot;Firewood available\&quot;,\&quot;Electric bike charging station\&quot;]&quot;,&quot;rules&quot;:&quot;[\&quot;Dogs Allowed\&quot;,\&quot;Barbecueing On Pitch Allowed\&quot;,\&quot;Car On Pitch Allowed\&quot;]&quot;,&quot;slug&quot;:&quot;erzgebirgscamp-neuclausnitz&quot;,&quot;coordinates&quot;:&quot;(50.7411,13.516)&quot;,&quot;distance&quot;:&quot;3594.66454744824&quot;,&quot;zip&quot;:&quot;09623&quot;,&quot;town&quot;:&quot;Rechenberg-Bienenm\u00fchle&quot;,&quot;latitude&quot;:50.7411,&quot;longitude&quot;:13.516,&quot;street&quot;:&quot;Hauptstra\u00dfe 25&quot;,&quot;city_id&quot;:16,&quot;city_slug&quot;:&quot;sachsen&quot;,&quot;city&quot;:&quot;Sachsen&quot;,&quot;country&quot;:&quot;Deutschland&quot;,&quot;country_slug&quot;:&quot;de&quot;,&quot;currency&quot;:&quot;EUR&quot;,&quot;rating&quot;:&quot;5&quot;,&quot;podio_id&quot;:508050624,&quot;older_children_lower_age_limit&quot;:6,&quot;older_children_upper_age_limit&quot;:17,&quot;younger_children_lower_age_limit&quot;:0,&quot;younger_children_upper_age_limit&quot;:5,&quot;photo&quot;:&quot;https:\/\/intcamp-eu-west-1-live01-public.s3-eu-west-1.amazonaws.com\/de-live\/gallery_970x545_270661681-campsite.jpg,https:\/\/intcamp-eu-west-1-live01-public.s3-eu-west-1.amazonaws.com\/de-live\/gallery_970x545_270661691-campsite.jpg,https:\/\/intcamp-eu-west-1-live01-public.s3-eu-west-1.amazonaws.com\/de-live\/gallery_970x545_270661694-campsite.jpg&quot;,&quot;availability&quot;:{&quot;9962&quot;:{&quot;is_available&quot;:true,&quot;has_instant_booking&quot;:true,&quot;pitch_type&quot;:&quot;[\&quot;Motorhome\&quot;]&quot;},&quot;9959&quot;:{&quot;is_available&quot;:true,&quot;has_instant_booking&quot;:true,&quot;pitch_type&quot;:&quot;[\&quot;Tent\&quot;]&quot;},&quot;9960&quot;:{&quot;is_available&quot;:true,&quot;has_instant_booking&quot;:true,&quot;pitch_type&quot;:&quot;[\&quot;Tent\&quot;]&quot;},&quot;9961&quot;:{&quot;is_available&quot;:true,&quot;has_instant_booking&quot;:true,&quot;pitch_type&quot;:&quot;[\&quot;Caravan\&quot;]&quot;},&quot;9963&quot;:{&quot;is_available&quot;:true,&quot;has_instant_booking&quot;:true,&quot;pitch_type&quot;:&quot;[\&quot;Motorhome\&quot;]&quot;}},&quot;instant_booking&quot;:true,&quot;category&quot;:&quot;Regul\u00e4r&quot;,&quot;address&quot;:&quot;Hauptstra\u00dfe 25, 09623 Rechenberg-Bienenm\u00fchle, Sachsen, Deutschland&quot;,&quot;slashed_price&quot;:null,&quot;coordinatesShow&quot;:&quot;50.741, 13.516&quot;}" data-all-pitches="{&quot;tent&quot;:&quot;Zelt&quot;,&quot;caravan&quot;:&quot;Wohnwagen&quot;,&quot;motorhome&quot;:&quot;Wohnmobil&quot;,&quot;cabin&quot;:&quot;Mietunterkunft&quot;}" data-price-request="price" data-currency-code="EUR">
<div class="row">
<div class="col-xs-12 col-sm-9">
<h1 itemprop="name">Campingurlaub auf dem Erzgebirgscamp Neuclausnitz</h1>
</div>
<div class="col-sm-3 text-right label-instant-wrapper">
<span class="label-instant">
<i class="icon-ic_flash"></i>
Sofortbuchung</span>
</div>
</div>
<div class="row">
<div class="col-xs-12 col-sm-9">
<div class="property-address" itemprop="address" itemscope="" itemtype="https://schema.org/PostalAddress">
<span itemprop="streetAddress">Hauptstraße 25, 09623 Rechenberg-Bienenmühle, Sachsen, Deutschland</span>
<meta itemprop="addressCountry" content="Deutschland">
<meta itemprop="postalCode" content="09623">
</div>
<a class="property-address" target="_blank" href="//google.com/maps/search/Erzgebirgscamp+Neuclausnitz/@">
Hauptstraße 25, 09623 Rechenberg-Bienenmühle, Sachsen, Deutschland </a>
</div>
<div class="col-xs-12 col-sm-9 col-lg-3 rating-wrapper">
<span class="rating-number">5,0</span>
<span class="rating-stars icon-ic-11-ratings"></span>
<a class="rating-popup-link rating-popup-link-desktop" href="#" data-property-id="2645">(Bewertungen)</a>
<a class="rating-popup-link rating-popup-link-mobile" href="#" data-property-id="2645" data-more="(Bewertungen)" data-less="(Bewertungen ausblenden)">(Bewertungen)</a>
</div>
</div>
</section>

Q: I need to fetch the value inside data-campsite-data

On Firefox Firepath this works: //@data-campsite-data

What would be its equivalent using xsoup

Start by checking xsoup's documented attribute-selection or XPath entry points and reproduce the supplied HTML example. Done means the documented usage reliably returns the value of data-campsite-data.