1.4.0

• Any array thrown into the serializer with numeric keys is now simply
  traversed and each individual item is serialized. This fixes an issue
  related to serializing value objects with array children.
• When serializing value objects, properties that have a null value or an
  empty array are now skipped. We believe this to be the saner default, but
  does constitute a BC break for those depending on this.
• Serializing array properties in value objects was broken.

1.3.0

• The Service class adds a new mapValueObject method which provides basic
  capabilities to map between ValueObjects and XML.
• #61: You can now specify serializers for specific classes, allowing you
  separate the object you want to serialize from the serializer. This uses the
  $classMap property which is defined on both the Service and Writer.
• It's now possible to pass an array of possible root elements to
  Sabre\Xml\Service::expect().
• Moved some parsing logic to Reader::getDeserializerForElementName(),
  so people with more advanced use-cases can implement their own logic there.
• #63: When serializing elements using arrays, the value key in the array is
  now optional.
• #62: Added a keyValue deserializer function. This can be used instead of
  the Element\KeyValue class and is a lot more flexible. (@staabm)
• Also added an enum deserializer function to replace
  Element\Elements.
• Using an empty string for a namespace prefix now has the same effect as
  null.

1.2.0

• #53: Added parseGetElements, a function like parseInnerTree, except
  that it always returns an array of elements, or an empty array.

1.1.0

• #44, #45: Catching broken and invalid XML better and throwing
  Sabre\Xml\LibXMLException whenever we encounter errors. (@stefanmajoor,
  @DaanBiesterbos)

1.0.0

• No functional changes since 0.4.3. Marking it as 1.0.0 as a promise for
  API stability.
• Using php-cs-fixer for automated CS enforcement.

0.4.3

• Minor tweaks for the public release.

0.4.2

• Removed constants.php again. They messed with PHPUnit and don't really
  provide a great benefit.
• #41: Correctly handle self-closing xml elements.

0.4.1

• #40: An element with an empty namespace (xmlns="") is not allowed to have a
  prefix. This is now fixed.

0.4.0

• Added Sabre\Xml\Service. This is intended as a simple way to centrally
  configure xml applications and easily parse/write things from there. #35, #38.
• Renamed 'baseUri' to 'contextUri' everywhere.
• #36: Added a few convenience constants to lib/constants.php.
• Sabre\Xml\Util::parseClarkNotation is now in the Sabre\Xml\Service class.

0.3.1

• Added XmlDeserializable to match XmlSerializable.