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interface ConfigData extends CacheData
{
/**
 * Reads a property's value.
 * @param string $name Name of the property to read
 * @return string the read value
 * @throws PropertyNotFoundException If the property if not found
 */
function get_property($name);
 
/**
 * Sets a property value. If the property exists, it overrides its value,
 * otherwise, it creates an entry for this property.
 * @param string $name Name of the property
 * @param string $value Value of the property
 */
function set_property($name, $value);
 
/**
 * Sets the default value to avoid having unexisting values when we use it.
 * If some entries doesn't exist, they can be created here.
 */
function set_default_values();
}