getProperty(element, name) {
		const properties = element.getElementsByTagName('property');
		for (let property of properties) {
			if (property.getAttribute('name') === name) {
				return property.innerHTML;
			}
		}
		return null;
	}
Get property of producer/filter by name.

@param {Element} element Element containing properties.
@param {string} name Property name.
@return {?string} Return value of property or null when property not found.