Ol3: Extracting 'extended Data' From Kml

i have created a KML file with some custom attributes such as 'id' and 'room_id'. these attributes exist in the 'extended data' part of the KML file, here is the file:

Solution 1:

It's easy as:

 var properties = feature.getProperties();
 console.log(properties['id']);
 console.log(properties['room_id']);

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