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# Changelog
All notable changes to this project will be documented in this file.
This project adheres to [Semantic Versioning](http://semver.org/) and
[Keep a CHANGELOG](http://keepachangelog.com).
## Unreleased
### Added
- the Turtle encoder can now produce partial Turtle documents with the `:only` option
and any combination of the following values: `:triples`, `:directives`, `:base`, `:prefixes`
- the style of the Turtle directives produced by the Turtle encoder can be
switched to SPARQL style with the option `:directive_style` and the value `:sparql`
### Fixed
- adding an empty `RDF.Description` with a subject to an empty `RDF.Graph` resulted in
an invalid non-empty graph ([@pukkamustard](https://github.com/pukkamustard))
[Compare v0.8.1...HEAD](https://github.com/rdf-elixir/rdf-ex/compare/v0.8.1...HEAD)
## 0.8.1 - 2020-06-16
### Added
- query functions for basic graph pattern matching (incl. streaming-support)
[Compare v0.8.0...v0.8.1](https://github.com/rdf-elixir/rdf-ex/compare/v0.8.0...v0.8.1)
## 0.8.0 - 2020-06-01
RDF literals and their datatypes were completely redesigned to support derived XSD datatypes and
allow for defining custom datatypes.
For an introduction on how literals work now read the updated [page on literals in the guide](https://rdf-elixir.dev/rdf-ex/literals.html).
For more details on how to migrate from an earlier version read [this wiki page](https://github.com/rdf-elixir/rdf-ex/wiki/Upgrading-to-RDF.ex-0.8).
### Added
- a lot of new datatypes like `xsd:float`, `xsd:byte` or `xsd:anyURI` -- all numeric XSD datatypes
are now available; see [this page of the API documentation](https://hexdocs.pm/rdf/RDF.XSD.Datatype.html#module-builtin-xsd-datatypes)
for an up-to-date list of all supported and missing XSD datatypes
- an implementation of XSD facet system now makes it easy to define own custom datatypes via
restriction of the existing XSD datatypes
- `RDF.Literal.update/2` updates the value of a `RDF.Literal` without changing anything else,
eg. the language or datatype
### Changed
- the `RDF.Literal` struct now consists entirely of a datatype-specific structs in the `literal` field,
which besides being more memory-efficient (since literals no longer consist of all possible fields a literal might have),
allows pattern matching now on the datatype of literals.
- RDF XSD datatypes are now defined in the `RDF.XSD` namespace
- alias constructor functions for the XSD datatypes are now defined on `RDF.XSD`
- `matches?`, `less_than?`, `greater_than` as higher level functions were removed from the
`RDF.Literal.Datatype` modules
- `less_than?`, `greater_than?` now always return a boolean and no longer `nil` when incomparable;
you can still determine if two terms are comparable by checking if `compare/2` returns `nil`
- the `language` option is not supported on the `RDF.XSD.String.new/2` constructor
- the `language` option on `RDF.Literal.new/2` is no longer ignored if it's empty (`nil` or `""`),
so this either produces an invalid `RDF.LangString` now or, if another `datatype` is provided will
fail with an `ArgumentError`
- `canonical` now performs implicit coercions when passed plain Elixir values
- the inspect format for literals was changed and is now much more informative and uniform, since
you now always see the value, the lexical form and if the literal is valid
- `RDF.Namespace.resolve_term/1` now returns ok or error tuples, but a new function
`RDF.Namespace.resolve_term!/1` with the old behaviour was added
- Elixir versions < 1.8 are no longer supported
### Fixed
- numeric operations on invalid numeric literals no longer fail, but return `nil` instead
- Datetimes preserve the original lexical form of the timezone when casting from a date
- BEAM error warnings when trying to use top-level modules as vocabulary terms
[Compare v0.7.1...v0.8.0](https://github.com/rdf-elixir/rdf-ex/compare/v0.7.1...v0.8.0)
## 0.7.1 - 2020-03-11
### Added
- proper typespecs so that Dialyzer passes without warnings ([@rustra](https://github.com/rustra))
### Fixed
- `RDF.XSD.Time` didn't handle 24h overflows with an offset correctly
[Compare v0.7.0...v0.7.1](https://github.com/rdf-elixir/rdf-ex/compare/v0.7.0...v0.7.1)
## 0.7.0 - 2019-11-22
### Added
- `RDF.Diff` data structure for diffs between RDF graphs and descriptions
- `RDF.Description.update/4` updates the objects of a predicate in a description
with a custom update function
- `RDF.Graph.update/4` updates the descriptions of a subject in a graph
with a custom update function
- `RDF.Description.take/2` creates a description from another one by limiting
its statements to a set of predicates
- `RDF.Graph.take/3` creates a graph from another one by limiting
its statements to a set of subjects and optionally also a set of predicates
- `RDF.Graph.clear/1` removes the triples from a graph
- Mix formatter configuration for using `defvocab` without parens
### Changed
- `RDF.Serialization.Writer.write_file/4` which is the basis used by all the
`write_file/3` and `write_file!/3` functions of all serialization format modules
like `RDF.NTriples`, `RDF.Turtle`, `JSON.LD` etc. now opens file in a different
mode: it no longer opens them with the [`:utf8` option](https://hexdocs.pm/elixir/File.html#open/2).
First, this by default slowed down the writing, but more importantly could lead
to unexpected encoding issues.
This is a **breaking change**: If your code relied on this file mode, you can
get the old behaviour, by specifying the `file_mode` on these functions
accordingly as `[:utf8, :write, :exclusive]`. For example, to write a Turtle
file with the old behaviour, you can do it like this:
```elixir
RDF.Turtle.write_file!(some_data, some_path, file_mode: ~w[utf8 write exclusive]a)
```
[Compare v0.6.2...v0.7.0](https://github.com/rdf-elixir/rdf-ex/compare/v0.6.2...v0.7.0)
## 0.6.2 - 2019-09-08
### Added
- field `base_iri` on `RDF.Graph` structure which can be set via new `base_iri`
option on `RDF.Graph.new` or the new functions `RDF.Graph.set_base_iri/2`
and `RDF.Graph.clear_base_iri/1`
- `RDF.Graph.clear_metadata/1` which clears the base IRI and the prefixes
- `RDF.IRI.coerce_base/1` which coerces base IRIs; as opposed to `RDF.IRI.new/1`
it also accepts bare `RDF.Vocabulary.Namespace` modules
### Changed
- `RDF.Turtle.Decoder` saves the base IRI in the `RDF.Graph` now
- `RDF.Turtle.Encoder` now takes the base IRI to be used during serialization in
the following order of precedence:
- from the `base` option or its new alias `base_iri`
- from the `base_iri` field of the given graph
- from the `RDF.default_base_iri` returning the one from the application
configuration
- `RDF.PrefixMap.new` and `RDF.PrefixMap.add` now also accepts terms from
`RDF.Vocabulary.Namespace`s as namespaces
### Fixed
- Vocabulary namespace modules weren't always detected properly
[Compare v0.6.1...v0.6.2](https://github.com/rdf-elixir/rdf-ex/compare/v0.6.1...v0.6.2)
## 0.6.1 - 2019-07-15
### Added
- `RDF.IRI.to_string/1` returns the string representation of an `RDF.IRI`
(implicitly resolving vocabulary namespace terms)
- `RDF.Literal.matches?/3` for XQuery regex pattern matching
- `RDF.Decimal.digit_count/1` and `RDF.Decimal.fraction_digit_count/1` for
determining the number of digits of decimal literals
### Fixed
- language literals were not properly unescaped during Turtle parsing
- `RDF.Literal.new/1` can take decimals and infers the datatype `xsd:decimal`
correctly
- `true` and `false` with capital letters are no longer valid `RDF.Boolean`s
following the XSD specification; the same applies for booleans in Turtle
- `+INF` is no longer a valid `RDF.Double` (positive infinity doesn't expect a sign)
- slightly improve output of errors during parsing of Turtle, N-Triples and N-Quads
[Compare v0.6.0...v0.6.1](https://github.com/rdf-elixir/rdf-ex/compare/v0.6.0...v0.6.1)
## 0.6.0 - 2019-04-06
see [here](https://github.com/rdf-elixir/rdf-ex/wiki/Upgrading-to-RDF.ex-0.6) for
upgrading notes to RDF.ex 0.6
### Added
- `RDF.PrefixMap`
- prefix management of `RDF.Graph`s:
- the structure now has a `prefixes` field with an optional `RDF.PrefixMap`
- new functions `add_prefixes/2`, `delete_prefixes/2` and `clear_prefixes/1`
- configurable `RDF.default_prefixes`
- `RDF.Description.equal?/2`, `RDF.Graph.equal?/2`, `RDF.Dataset.equal?/2` and
`RDF.Data.equal?/2`
### Changed
- the constructor functions for `RDF.Graph`s and `RDF.Dataset`s now take the
graph name resp. dataset name through a `name` option, instead of the first
argument
- `RDF.Graph.new` supports an additional `prefixes` argument to initialize the
`prefixes` field
- when `RDF.Graph.add` and `RDF.Graph.put` are called with another graph, its
prefixes are merged
- `RDF.Turtle.Decoder` saves the prefixes now
- `RDF.Turtle.Encoder` now takes the prefixes to be serialized in the following
order of precedence:
- from the `prefixes` option (as before)
- from the `prefixes` field of the given graph
- from the `RDF.default_prefixes`
- drop support for OTP < 20, since prefixes can consist of UTF characters which
are not supported in atoms on these versions
[Compare v0.5.4...v0.6.0](https://github.com/rdf-elixir/rdf-ex/compare/v0.5.4...v0.6.0)
## 0.5.4 - 2019-01-17
### Fixed
- issue with Elixir 1.8
- `RDF.write_file` and `RDF.write_file!` delegators had wrong signatures
[Compare v0.5.3...v0.5.4](https://github.com/rdf-elixir/rdf-ex/compare/v0.5.3...v0.5.4)
## 0.5.3 - 2018-11-11
### Added
- `RDF.Triple.valid?/1`, `RDF.Quad.valid?/1` and `RDF.Statement.valid?/1`, which
validate if a tuple is a valid RDF triple or RDF quad
[Compare v0.5.2...v0.5.3](https://github.com/rdf-elixir/rdf-ex/compare/v0.5.2...v0.5.3)
## 0.5.2 - 2018-11-04
### Added
- `RDF.Term.value/1` returning the native Elixir value of a RDF term
- `RDF.Statement.values/1`, `RDF.Triple.values/1` and `RDF.Quad.values/1`
returning a tuple of `RDF.Term.value/1` converted native Elixir values from a
tuple of RDF terms
- `RDF.Description.values/1`, `RDF.Graph.values/1`, `RDF.Dataset.values/1` and
`RDF.Data.values/1` returning a map of `RDF.Term.value/1` converted native
Elixir values from the respective structure of RDF terms
- for all of aforementioned `values/1` functions a variant `values/2` which
allows to specify custom mapping function to be applied when creating the resp.
structure
- `RDF.Literal.compare/2`, `RDF.Literal.less_than?/2` and `RDF.Literal.greater_than?/2`
for `RDF.Datatype` aware comparisons of `RDF.Literal`s
### Fixed
- `RDF.DateTime.equal_value?/2` and `RDF.Date.equal_value?/2` did not handle
timezones correctly
- `-00:00` is a valid timezone offset on `RDF.DateTime`
[Compare v0.5.1...v0.5.2](https://github.com/rdf-elixir/rdf-ex/compare/v0.5.1...v0.5.2)
## 0.5.1 - 2018-09-17
### Fixed
- generated Erlang output files of Leex and Yecc are excluded from Hex package
[Compare v0.5.0...v0.5.1](https://github.com/rdf-elixir/rdf-ex/compare/v0.5.0...v0.5.1)
## 0.5.0 - 2018-09-17
### Added
- Possibility to execute simple SPARQL queries against `RDF.Graph`s with
[SPARQL 0.2](https://github.com/rdf-elixir/sparql-ex/blob/master/CHANGELOG.md)
- New `RDF.Term` protocol implemented for all structs representing RDF nodes and
all native Elixir datatypes which are coercible to those modules. For now, it
mainly offers, besides the coercion, just the function `RDF.Term.equal?/2` and
`RDF.Term.equal_value?/2` for term- and value comparisons.
- New `RDF.Decimal` datatype for `xsd:decimal` literals and support for decimal
literals in Turtle encoder
- `RDF.Numeric` module with a list of all numeric datatypes and shared functions
for all numeric literals, eg. arithmetic functions
- Various new `RDF.Datatype` function
- `RDF.Datatype.cast/1` for casting between `RDF.Literal`s as specified in the
XSD spec on all `RDF.Datatype`s
- logical operators and the Effective Boolean Value (EBV) coercion algorithm
from the XPath and SPARQL specs on `RDF.Boolean`
- various functions on the `RDF.DateTime` and `RDF.Time` datatypes
- `RDF.LangString.match_language?/2`
- Many new convenience functions on the top-level `RDF` module
- constructors for all of the supported `RDF.Datatype`s
- constant functions `RDF.true` and `RDF.false` for the two boolean `RDF.Literal` values
- `RDF.Literal.Guards` which allow pattern matching of common literal datatypes
- `RDF.BlankNode.Generator`
- Possibility to configure an application-specific default base IRI; for now it
is used only on reading of RDF serializations (when no `base` specified)
### Changed
- Elixir versions < 1.6 are no longer supported
- `RDF.String.new/2` and `RDF.String.new!/2` produce a `rdf:langString` when
given a language tag
- Some of the defined structs now enforce keys on compile-time (via Elixirs
`@enforce_keys` feature) when not setting the corresponding fields would lead
to invalid structs, namely the following fields:
- `RDF.IRI.value`
- `RDF.BlankNode.id`
- `RDF.Description.subject`
- `RDF.List.head`
### Fixed
- `RDF.resource?/1` does not fail anymore when called with unresolvable atoms
but returns `false` instead
- `RDF.IRI.absolute/2` does not fail with a `FunctionClauseError` when the given
base is not absolute, but returns `nil` instead
- `RDF.DateTime` and `RDF.Time` store microseconds
- `RDF.DateTime`: '24:00:00' is a valid time in a xsd:dateTime; the dateTime
value so represented is the first instant of the following day
- `RDF.LangString`: non-strings or the empty string as language produce invalid
literals
[Compare v0.4.1...v0.5.0](https://github.com/rdf-elixir/rdf-ex/compare/v0.4.1...v0.5.0)
## 0.4.1 - 2018-03-19
### Added
- `RDF.Literal.new!/2` which fails when creating an invalid literal
### Changed
- `RDF.Literal.new/2` can create `rdf:langString` literals without failing, they
are simply invalid; if you want to fail without a language tag use the new
`RDF.Literal.new!/2` function
[Compare v0.4.0...v0.4.1](https://github.com/rdf-elixir/rdf-ex/compare/v0.4.0...v0.4.1)
## 0.4.0 - 2018-03-10
### Changed
- renamed `RDF.Serialization` behaviour to `RDF.Serialization.Format`; the new
`RDF.Serialization` module contains just simple RDF serialization related functions
- renamed `RDF.Serialization.Format` function `content_type/0` to `media_type/0`
- moved `RDF.Reader` and `RDF.Writer` into `RDF.Serialization` module
- removed the limitation to serialization formats defined in the core RDF.ex package
for use as a source of `RDF.Vocabulary.Namespace`s; so you can now also define
vocabulary namespaces from JSON-LD files for example, provided that the corresponding
Hex package is defined as a dependency
### Added
- `RDF.Serialization.Format`s define a `name` atom
- all `RDF.Serialization.Reader` and `RDF.Serialization.Writer` functions are now
available on the `RDF.Serialization` module (or aliased on the top-level `RDF`
module) and the format can be specified instead of a `RDF.Serialization.Format`
argument, via the `format` or `media_type` option or in case of `*_file`
functions, without explicit specification of the format, but inferred from file
name extension instead; see the updated README section about RDF serializations
- the following functions to access available `RDF.Serialization.Format`s:
- `RDF.Serialization.formats/0`
- `RDF.Serialization.available_formats/0`
- `RDF.Serialization.format/1`
- `RDF.Serialization.format_by_media_type/1`
- `RDF.Serialization.format_by_extension/1`
[Compare v0.3.1...v0.4.0](https://github.com/rdf-elixir/rdf-ex/compare/v0.3.1...v0.4.0)
## 0.3.1 - 2018-01-19
### Added
- `Collectable` implementations for all `RDF.Data` structures so they can be
used as destinations of `Enum.into` and `for` comprehensions
### Fixed
- Fix `unescape_map` in `parse_helper` for Elixir 1.6 ([@ajkeys](https://github.com/ajkeys))
[Compare v0.3.0...v0.3.1](https://github.com/rdf-elixir/rdf-ex/compare/v0.3.0...v0.3.1)
## 0.3.0 - 2017-08-24
### Added
- `RDF.IRI` as a more suitable URI/IRI representation for RDF, bringing enormous
performance and memory consumption benefits (see [here](https://github.com/rdf-elixir/rdf-ex/issues/1)
for the details about the improvements)
### Changed
- use `RDF.IRI` instead of Elixirs `URI` everywhere
- use the term _iri_ instead of _uri_ consistently, leading to the following
function renamings:
- `base_iri` instead of `base_uri` for the definition of `RDF.Vocabulary.Namespace`s
- `__base_iri__` instead of `__base_uri__` in all `RDF.Vocabulary.Namespace`s
- `__iris__` instead of `__uris__` in all `RDF.Vocabulary.Namespace`s
- `RDF.IRI.InvalidError` instead of `RDF.InvalidURIError`
- `RDF.Literal.InvalidError` instead of `RDF.InvalidLiteralError`
- `RDF.Namespace.InvalidVocabBaseIRIError` instead of `RDF.Namespace.InvalidVocabBaseURIError`
- show compilation message of vocabulary namespaces always to be able to relate
resp. errors and warnings
### Fixed
- when trying to resolve a term from an undefined module a `RDF.Namespace.UndefinedTermError`
exception
[Compare v0.2.0...v0.3.0](https://github.com/rdf-elixir/rdf-ex/compare/v0.2.0...v0.3.0)
## 0.2.0 - 2017-08-12
### Added
- full Turtle support
- `RDF.List` structure for the representation of RDF lists
- `describes?/1` on `RDF.Data` protocol and all RDF data structures which checks
if statements about a given resource exist
- `RDF.Data.descriptions/1` which returns all descriptions within a RDF data structure
- `RDF.Description.first/2` which returns a single object to a predicate of a `RDF.Description`
- `RDF.Description.objects/2` now supports a custom filter function
- `RDF.bnode?/1` which checks if the given value is a blank node
### Changed
- Rename `RDF.Statement.convert*` functions to `RDF.Statement.coerce*`
- Don't support Elixir versions < 1.4
### Fixed
- `RDF.uri/1` and URI parsing of N-Triples and N-Quads decoders preserve empty fragments
- booleans weren't recognized as coercible literals on object positions
- N-Triples and N-Quads decoder didn't handle escaping properly
[Compare v0.1.1...v0.2.0](https://github.com/rdf-elixir/rdf-ex/compare/v0.1.1...v0.2.0)
## 0.1.1 - 2017-06-25
### Fixed
- Add `src` directory to package files.
[Compare v0.1.0...v0.1.1](https://github.com/rdf-elixir/rdf-ex/compare/v0.1.0...v0.1.1)
## 0.1.0 - 2017-06-25
Initial release
Note: This version is not usable, since the `src` directory is not part of the
package, which has been immediately fixed on version 0.1.1.
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