* skip the comment if property is not set

* Add Entity which is not by default supported by this library * @param {string} key * @param {string} value

* @param {array} arr * @param {object} options * @param {Matcher} matcher - Path matcher instance * @returns object

* Extract namespace from raw tag name * @param {string} rawTagName - Tag name possibly with namespace (e.g., "soap:Envelope") * @returns {string|und

* Extract raw attributes (without prefix) from prefixed attribute map * @param {object} prefixedAttrs - Attributes with prefix from buildAttributesMa