## 0.2.1 (28 September 2016)

- Fixed issue where `Datacite::Mapping::Date` objects initialized with Ruby
  `Dates` or `Datetimes` couldn't be serialized to XML.

## 0.2.0 (26 September 2016)

- Datacite 4.0 support:
  - reading supports both Datacite 3 and Datacite 4
  - writing now defaults to Datacite 4
    - deprecated elements will produce a warning
  - Datacite 3 support via `mapping: :datacite_3`
    - invalid elements (`<geoLocationPolygon/>`, `<fundingReference>`)
      will be dropped, with a warning
    - [IGSN](http://igsn.github.io/overview/) identifiers will be converted to Handle identifiers
- `language` and `xml:lang` attributes no longer default to `'en'` and are 
  now fully optional.
- `Date` now properly supports [RKMS-ISO8601](http://www.ukoln.ac.uk/metadata/dcmi/collection-RKMS-ISO8601/)
  date ranges
- Remove `Datacite::Mapping.log` in favor of `warn()`
- Array fields (`subjects`, `contributors`, etc.) can no longer be set to nil; if set to 
  nil they will instead return an empty array.
- `:nonvalidating` mapping has been removed. Instead:
  - `<subject/>` and `<description/>` tags without text are ignored on read, as are `<geoLocation>`
    tags with no child elements.
  - missing `<identifiers/>` and `<identifiers/>` with missing values are ignored on read, but
    the `Resource` must be given a valid `Identifier` before writing it back out.

## 0.1.18 (unreleased)

- Datacite 4.0 support:
  - read Datacite 4.0 `<fundingReference/>` tag (introduced in 0.1.17)
  - read Datacite 4.0 `<geoLocationBox>` nodes with coordinates in child nodes
    (`<southBoundLatitude>`, `<westBoundLongitude>`, `<northBoundLatitude>`, `<eastBoundLongitude>`)
    rather than element text
  - read Datacite 4.0 `<geoLocationPoint` nodes coordinates in child nodes
    (`<pointLatitude>`, `<pointLongitude>`) rather than element text

## 0.1.17.2 (19 August 2016)

- Filter out `<subject/>` tags without values

## 0.1.17.1 (5 August 2016)

- In `Rights::CC_BY`, use "Creative Commons Attribution 4.0 International (CC BY 4.0)" 
  as value, as per [summary](https://creativecommons.org/licenses/by/4.0/), instead of 
  "Creative Commons Attribution 4.0 International (CC-BY)".

## 0.1.17 (5 August 2016)

- Added experimental support for Datacite 4.0 `<fundingReference/>` tag
- Added convenience constants `Rights::CC_ZERO` and `Rights::CC_BY` for the
  [CC0](https://creativecommons.org/publicdomain/zero/1.0/legalcode) public domain declaration
  and [CC-BY](https://creativecommons.org/licenses/by/4.0/) Creative Commons Attribution License

## 0.1.16 (14 July 2016)

- Add new `:nonvalidating` mapping for less strict parsing of problem files.
- Provide better error messages for missing identifier values.

## 0.1.15 (18 May 2016)

- Update to XML::MappingExtensions 0.4.1

## 0.1.14 (17 May 2016)

- Fix issues with XML::MappingExtensions 0.4.x

## 0.1.13 (2 May 2016)

- Update to XML::MappingExtensions 0.3.6 for improved namespace support
- Added `namespace_prefix` accessor to `Resource` to support explicit namespace prefixing
- Update to TypesafeEnum 0.1.7 for improved debug output

## 0.1.12 (28 April 2016)

- Update to XML::MappingExtensions 0.3.5

## 0.1.11 (28 April 2016)

- (withdrawn)

## 0.1.10 (25 April 2016)

- Replace all `require_relative` with absolute `require` to avoid symlink issues

## 0.1.9 (19 April 2016)

- Added convenience methods to directly access creator names and affiliations
- Added convenience methods to directly access funder attributes

## 0.1.8 (7 April 2016)

- Add convenience method `Identifier.from_doi()` to parse DOI strings in various formats (`doi:`,
  `http://dx.doi.org/`, etc.)

## 0.1.7 (28 March 2016)

- Stop having XML::Mapping generate accessors for fields that need validation (& stop using aliasing
  to layer validation on top of generated accessors)

## 0.1.6 (24 March 2016)

- Make validation method aliasing more robust against double-require problems, hopefully preventing
  `SystemStackError (stack level too deep)` on misconfigured systems

## 0.1.5 (27 Jan 2016)

- Make gemspec smart enough to handle SSH checkouts
- Update to [XML::MappingExtensions](https://github.com/dmolesUC3/xml-mapping_extensions) 0.3.4
- Update to [TypesafeEnum](https://github.com/dmolesUC3/typesafe_enum) 0.1.5

## 0.1.4 (6 Jan 2016)

- Fix issue where missing `xml:lang` attribute in `<resource>` would produce a `no value, and no default value`
  error instead of defaulting to `'en'` as documented
- Ensure that YARD formats README correctly when converting from GitHub-flavored Markdown to HTML
- Update to [XML::MappingExtensions](https://github.com/dmolesUC3/xml-mapping_extensions) 0.3.3

## 0.1.3 (18 Dec 2015)

- Update to [TypesafeEnum](https://github.com/dmolesUC3/typesafe_enum) 0.1.4

## 0.1.2 (17 Dec 2015)

- Update to [TypesafeEnum](https://github.com/dmolesUC3/typesafe_enum) 0.1.3

## 0.1.1 (14 Dec 2015)

- Update to [XML::MappingExtensions](https://github.com/dmolesUC3/xml-mapping_extensions) 0.3.2, allowing
  use of [#parse_xml](http://www.rubydoc.info/github/dmolesUC3/xml-mapping_extensions/master/XML/Mapping/ClassMethods#parse_xml-instance_method)
  and [#write_xml](http://www.rubydoc.info/github/dmolesUC3/xml-mapping_extensions/master/XML/Mapping#write_xml-instance_method)
  in examples and tests

## 0.1.0 (10 Dec 2015)

- Initial release