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* fix: HTTP 308 Permanent Redirect status code handling (#2389)Iwan Aucamp2023-05-1713-35/+1002
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Change the handling of HTTP status code 308 to behave more like `urllib.request.HTTPRedirectHandler`, most critically, the new 308 handling will create a new `urllib.request.Request` object with the new URL, which will prevent state from being carried over from the original request. One case where this is important is when the domain name changes, for example, when the original URL is `http://www.w3.org/ns/adms.ttl` and the redirect URL is `https://uri.semic.eu/w3c/ns/adms.ttl`. With the previous behaviour, the redirect would contain a `Host` header with the value `www.w3.org` instead of `uri.semic.eu` because the `Host` header is placed in `Request.unredirected_hdrs` and takes precedence over the `Host` header in `Request.headers`. Other changes: - Only handle HTTP status code 308 on Python versions before 3.11 as Python 3.11 will handle 308 by default [[ref](https://docs.python.org/3.11/whatsnew/changelog.html#id128)]. - Move code which uses `http://www.w3.org/ns/adms.ttl` and `http://www.w3.org/ns/adms.rdf` out of `test_guess_format_for_parse` into a separate parameterized test, which instead uses the embedded http server. This allows the test to fully control the `Content-Type` header in the response instead of relying on the value that the server is sending. This is needed because the server is sending `Content-Type: text/plain` for the `adms.ttl` file, which is not a valid RDF format, and the test is expecting `Content-Type: text/turtle`. Fixes: - <https://github.com/RDFLib/rdflib/issues/2382>.
* test: Eliminate flake8 errors in tests (#2353)Iwan Aucamp2023-04-1419-51/+27
| | | | | | | | | | | | | | | | | | | | | Eliminate some occurrences of the following flake8 errors in tests: * E265 block comment should start with '# ' * E266 too many leading '#' for block comment * E402 module level import not at top of file * E712 comparison to False should be 'if cond is False:' or 'if not cond:' * E712 comparison to True should be 'if cond is True:' or 'if cond:' * E722 do not use bare 'except' * F401 ... imported but unused * F403 ... used; unable to detect undefined names * F405 ... may be undefined, or defined from star imports: ... * F541 f-string is missing placeholders * F841 local variable 'result' is assigned to but never used * N806 variable 'TEST_DIR' in function should be lowercase This is pursuant to eliminating [flakeheaven](https://github.com/flakeheaven/flakeheaven), as it no longer supports the latest version of flake8 [[ref](https://github.com/flakeheaven/flakeheaven/issues/132)].
* fix: correct imports and `__all__` (#2340)Iwan Aucamp2023-04-1218-59/+43
| | | | | | | | Disable [`implicit_reexport`](https://mypy.readthedocs.io/en/stable/config_file.html#confval-implicit_reexport) and eliminate all errors reported by mypy after this. This helps ensure that import statements import from the right module and that the `__all__` variable is correct.
* feat: add optional `target_graph` argument to `Graph.cbd` and use it for ↵Matt Goldberg2023-04-111-1/+26
| | | | | | | | | DESCRIBE queries (#2322) Add optional keyword only `target_graph` argument to `rdflib.graph.Graph.cbd` and use this new argument in `evalDescribeQuery`. This makes it possible to compute a concise bounded description without creating a new graph to hold the result, and also without potentially having to copy it to another final graph. Co-authored-by: Iwan Aucamp <aucampia@gmail.com>
* refactor: eliminate inheritance from object (#2339)Iwan Aucamp2023-04-105-5/+5
| | | | | This change removes the redundant inheritance from `object` (i.e. `class Foo(object): pass`) that is no longer needed in Python 3 and is a relic from Python 2.
* fix: `ROUND`, `ENCODE_FOR_URI` and `SECONDS` SPARQL functions (#2314)Iwan Aucamp2023-03-261-0/+189
| | | | | | | | | `ROUND` was not correctly rounding negative numbers towards positive infinity, `ENCODE_FOR_URI` incorrectly treated `/` as safe, and `SECONDS` did not include fractional seconds. This change corrects these issues. - Closes <https://github.com/RDFLib/rdflib/issues/2151>.
* fix: restore the 6.1.1 default bound namespaces (#2313)Iwan Aucamp2023-03-265-16/+108
| | | | | | | | | | | | The namespaces bound by default by `rdflib.graph.Graph` and `rdflib.namespace.NamespaceManager` was reduced in version 6.2.0 of RDFLib, however, this also would cause code that worked with 6.1.1 to break, so this constituted a breaking change. This change restores the previous behaviour, binding the same namespaces as was bound in 6.1.1. To bind a reduced set of namespaces, the `bind_namespaces` parameter of `rdflib.graph.Graph` or `rdflib.namespace.NamespaceManager` can be used. - Closes <https://github.com/RDFLib/rdflib/issues/2103>.
* fix: reference to global inside `get_target_namespace_elements` (#2311)Iwan Aucamp2023-03-251-0/+15
| | | | | | | `get_target_namespace_elements` references the `args` global, which is not defined if the function is called from outside the module. This commit fixes that instead referencing the argument passed to the function. - Closes <https://github.com/RDFLib/rdflib/issues/2072>.
* fix: Add `to_dict` method to the JSON-LD `Context` class. (#2310)Iwan Aucamp2023-03-252-0/+95
| | | | | | | | | | `Context.to_dict` is used in JSON-LD serialization, but it was not implemented. This change adds the method. - Closes <https://github.com/RDFLib/rdflib/issues/2138>. --------- Co-authored-by: Marc-Antoine Parent <maparent@acm.org>
* fix: change the prefix for `https://schema.org/` back to `schema` (#2312)Iwan Aucamp2023-03-251-3/+3
| | | | | | | The default prefix for `https://schema.org/` registered with `rdflib.namespace.NamespaceManager` was inadvertently changed to `sdo` in 6.2.0, this however constitutes a breaking change, as code that was using the `schema` prefix would no longer have the same behaviour. This change changes the prefix back to `schema`.
* test: remove xfail on SPARQL DESCRIBE test (#2309)Iwan Aucamp2023-03-251-3/+0
| | | | | SPARQL DESCRIBE was implemented in <https://github.com/RDFLib/rdflib/pull/2221> so there should be no `xfail` on it tests for it. This change removes one such `xfail` that was in place.
* fix: JSON-LD context construction from a `dict` (#2306)Iwan Aucamp2023-03-241-0/+21
| | | | | | | | | | A variable was only being initialized for string-valued inputs, but if a `dict` input was passed the variable would still be accessed, resulting in a `UnboundLocalError`. This change initializes the variable always, instead of only when string-valued input is used to construct a JSON-LD context. - Closes <https://github.com/RDFLib/rdflib/issues/2303>.
* fix: IRI to URI conversion (#2304)Iwan Aucamp2023-03-234-4/+94
| | | | | | | | | | | | | | | | | The URI to IRI conversion was percentage-quoting characters that should not have been quoted, like equals in the query string. It was also not quoting things that should have been quoted, like the username and password components of a URI. This change improves the conversion by only quoting characters that are not allowed in specific parts of the URI and quoting previously unquoted components. The safe characters for each segment are taken from [RFC3986](https://datatracker.ietf.org/doc/html/rfc3986). The new behavior is heavily inspired by [`werkzeug.urls.iri_to_uri`](https://github.com/pallets/werkzeug/blob/92c6380248c7272ee668e1f8bbd80447027ccce2/src/werkzeug/urls.py#L926-L931) though there are some differences. - Closes <https://github.com/RDFLib/rdflib/issues/2120>.
* test: add `webtest` marker to tests that use the internet (#2295)Iwan Aucamp2023-03-216-1/+57
| | | | | | | | | | | This is being done so that it is easier for downstream packagers to run the test suite without requiring internet access. To run only tests that does not use the internet, run `pytest -m "not webtest"`. The validation workflow validates that test run without internet access by running the tests inside `firejail --net=none`. - Closes <https://github.com/RDFLib/rdflib/issues/2293>.
* fix: add the `wgs` namespace binding back (#2294)Iwan Aucamp2023-03-211-0/+51
| | | | | | <https://github.com/RDFLib/rdflib/pull/1686> inadvertently removed the `wgs` prefix. This change adds it back. - Closes <https://github.com/RDFLib/rdflib/issues/2196>.
* fix: add `__hash__` and `__eq__` back to `rdflib.paths.Path` (#2292)Iwan Aucamp2023-03-212-9/+45
| | | | | | | | | | | | | These methods were removed when `@total_ordering` was added, but `@total_ordering` does not add them, so removing them essentially removes functionality. This change adds the methods back and adds tests to ensure they work correctly. All path related tests are also moved into one file. - Closes <https://github.com/RDFLib/rdflib/issues/2281>. - Closes <https://github.com/RDFLib/rdflib/issues/2242>.
* build(deps-dev): bump mypy from 1.0.1 to 1.1.1 (#2274)dependabot[bot]2023-03-191-1/+2
| | | | | | | | | | | | | | | | | | build(deps-dev): bump mypy from 1.0.1 to 1.1.1 Bumps [mypy](https://github.com/python/mypy) from 1.0.1 to 1.1.1. - [Release notes](https://github.com/python/mypy/releases) - [Commits](https://github.com/python/mypy/compare/v1.0.1...v1.1.1) updated-dependencies: - dependency-name: mypy dependency-type: direct:development update-type: version-update:semver-minor Also added type ignores for newly detected type errors. Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: Iwan Aucamp <aucampia@gmail.com>
* docs: document avaiable security measures (#2270)Iwan Aucamp2023-03-164-1/+235
| | | | | | | | | docs: document available security measures Several security measures can be used to mitigate risk when processing potentially malicious input. This change adds documentation about available security measures and examples and tests that illustrate their usage.
* fix: correctly handle resources with multiple comments in ↵Han Kruiger2023-03-143-0/+71
| | | | | | | defined_namespace_creator (#2254) FIxed a bug in defined_namespace_creator so that when a resource in an ontology is commented on multiple times (with e.g. rdfs:comment), it creates only a single class variable in the resulting DefinedNamespace where the Python comment is the concatenation of the rdfs:comments.
* fix: validation issues with examples (#2269)Iwan Aucamp2023-03-131-0/+31
| | | | | | | | | I want to add examples for securing RDFLib network access using `sys.addaudithook` and `urllib.request.install_opener`, but I want to also validate the examples in our CI pipeline, so we can demonstrate they work to our users. This change adds validation for all examples, and the addition of the security examples in a seperate PR will then also get validated.
* fix: add more type-hinting for SPARQL plugin (#2265)Jeffrey C. Lerman2023-03-121-1/+23
| | | | | | | | | | | | | | Here, adding type-hints to some of the SPARQL parser plugin code. Includes a couple of small consequent changes: 1. Minor refactor of `prettify_parsetree()`, separating the public-facing callable from the internal code that does not need to be public-facing. That allows the public-facing callable to have more informative and restrictive type-hints for its arguments. 2. Added some test-coverage for `expandUnicodeEscapes()` - initially for my own understanding, but seems useful to leave it in place since I didn't see test-coverage for that function. There should be no backwards-incompatible changes in this PR - at least, not intentionally. --------- Co-authored-by: Iwan Aucamp <aucampia@gmail.com>
* feat: add typing to `rdflib.util` (#2262)Iwan Aucamp2023-03-122-4/+11
| | | | | | | | Mainly so that users can use RDFLib in a safer way, and that we can make safer changes to RDFLib in future. There are also some accomodating type-hint related changes outside of `rdflib.util`. This change does not have a runtime impact.
* test: fix deprecation warnings (#2260)Iwan Aucamp2023-03-113-3/+3
| | | | This changes the test the code to avoid deprecation warnings that occur. Mostly related to changes in python threading and pytest.
* build(deps-dev): bump black from 22.12.0 to 23.1.0 (#2248)dependabot[bot]2023-03-1151-119/+10
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* fix: small InputSource related issues (#2255)Iwan Aucamp2023-03-1120-121/+1155
| | | | | | | | | | | | | | | | | | | | | | | | I have added a bunch of tests for `InputSource` handling, checking most kinds of input source with most parsers. During this, I detected the following issues that I fixed: - `rdflib.util._iri2uri()` was URL quoting the `netloc` parameter, but this is wrong and the `idna` encoding already takes care of special characters. I removed the URL quoting of `netloc`. - HexTuple parsing was handling the input source in a way that would only work for some input sources, and not raising errors for other input sources. I changed the input source handling to be more generic. - `rdflib.parser.create_input_source()` incorrectly used `file.buffer` instead of `source.buffer` when dealing with IO stream sources. Other changes with no runtime impact include: - Changed the HTTP mocking stuff in test slightly to accommodate serving arbitrary files, as I used this in the `InputSource` tests. - Don't use Google in tests, as we keep getting `urllib.error.HTTPError: HTTP Error 429: Too Many Requests` from it.
* build(deps-dev): bump mypy from 0.991 to 1.0.1 (#2247)dependabot[bot]2023-03-064-4/+8
| | | | | | | | | | | | | | | | | | | | | | | | * build(deps-dev): bump mypy from 0.991 to 1.0.1 Bumps [mypy](https://github.com/python/mypy) from 0.991 to 1.0.1. - [Release notes](https://github.com/python/mypy/releases) - [Commits](https://github.com/python/mypy/compare/v0.991...v1.0.1) --- updated-dependencies: - dependency-name: mypy dependency-type: direct:development update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com> * fix type errors --------- Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: Iwan Aucamp <aucampia@gmail.com>
* feat: Add SPARQL DESCRIBE query implementation (#2221)Matt Goldberg2023-02-071-0/+92
| | | | | | | | | This adds an implementation for SPARQL DESCRIBE queries, using the built-in `cbd` method. I see there are several issues and PRs for DESCRIBE implementation. I believe this should close #479 and should resolve #1913, or at least pick up where it left off. It should also resolve #1096. This implementation should support the full SPARQL specification for DESCRIBE; either explicit IRIs can be provided (with no WHERE clause), or variables projected from a WHERE clause can be provided, or variables projected from a WHERE clause AND explicit IRIs can be provided. If a WHERE clause is provided, it should be evaluated the same way as it would for a SELECT DISTINCT query (including dataset specifications). The expected results for the test cases provided match the behaviour seen when running the same queries against the same data using ARQ. A possible future extension would be to add a global option (similar to `rdflib.plugins.sparql.SPARQL_LOAD_GRAPHS`) to change the method used to describe resources instead of always using CBD.
* fix: bug applying VALUES outside of a GROUP BY (#2188)Rob B2023-01-291-1/+40
| | | Altering order in which aggregate variable aliases are renamed to user-defined variable names to ensure that when defining a `VALUES` pattern outside of a `GROUP BY`, the variables in the query are correctly joined to those defined in the `VALUES` pattern.
* fix: bug with `SELECT *` inside `SELECT *` (#2190)Rob B2023-01-291-0/+144
| | | | | | | Fixing use of `SELECT *` in sub-select within `SELECT *` parent query as discovered in https://github.com/RDFLib/rdflib/issues/1722. Now when an instance of `SELECT *` is encountered, the query tree/plan builder now correctly considers the projected variables of any sub-select statements when deciding which variables should be projected out. Fixes <https://github.com/RDFLib/rdflib/issues/1722>.
* build: move to poetry for dependency management; consolidate more settings ↵Jeffrey C. Lerman2023-01-172-3/+11
| | | | | | | | | | | | | | | | | | | | | | | into pyproject.toml (#2187) Replaced setuptools with poetry which provides simpler dependency management, dependency locking and virtual environment management. This makes it easier for new developers to get a sane development environment (i.e. just `poetry install`) and also makes our CI pipeline more reproducable as now most development tools and libraries will only change through dependabot which will reduce the build failures on main and make breaking changes in dependencies more visible with dependabot PRs. Other changes: - moved isort, mypy and coverage config from setup.cfg to pyproject.toml - Changes in the generated rdflib wheel: - removed wheel extras related to development (i.e. `tests`, `docs`, `dev`) as poetry dependency groups should be used instead. - Added an extra group `lxml` with a dependency on lxml. - Added version ranges to dependencies, and tests to ensure these version ranges are valid. - Changes to tests: - Change pyparsing related tests so they work with older pyparsing. - Made the html5lib related tests conditional on html5lib existing. - Runtime changes: - Use importlib.metadata to set `__version__`. - Changed the devcontainer and related config to avoid contamination and interference with the host environment. Co-authored-by: Iwan Aucamp <aucampia@gmail.com> Co-authored-by: Edmond Chuc <edmond.chuc@outlook.com>
* fix: missing query string params in sparqlconnector when using POST method ↵David Andreoletti2023-01-021-0/+76
| | | | | | | (#2180) The SPARQLConnector instance created by a SPARQLStore instance providing endpoint url + query string params using POST method did not append the query string to endpoint url. Co-authored-by: Iwan Aucamp <aucampia@gmail.com>
* feat: do not write prefix for empty graph id (#2160)Elie Roux2022-12-301-0/+6
| | | Since the names of empty graphs do not appear in the serialization, do not consider them for namespace issues.
* fix: don't modify base when processing context inputsHarold Solbrig2022-12-246-2/+25
| | | The the base URI passed to _prep_sources was being overwritten in anticipation of processing inner nestings, but this caused problems when processing multiple inputs. Changed the assignment to `base` to `new_base`.
* fix: don't reuse same dict for headers in SPARQL HTTP requestsgitmpje2022-12-242-0/+47
| | | | | | Copy kwargs dict to prevent POST headers to be used in GET request and vice versa. Co-authored-by: Mark van der Pas <mark.van.der.pas@semaku.com> Co-authored-by: Iwan Aucamp <aucampia@gmail.com>
* fix: compute_qname handle case where name could be unbound (#2169)Tom Gillespie2022-12-143-1/+189
| | | | | | | | | | | | | | | | | | | | | | | | | | | * compute_qname handle case where name could be unbound In NamespaceManager.compute_qname it is possible for the variable name to be unbound when a namespace is used as a predicate e.g. ns2: and the namespace itself cannot be split any further. Fixing this usually just kicks the can down the road because the only reason to hit this condition is that you are trying to serialize a predicate that has no valid NCName form into an xml format that requires one, making it impossible to complete the conversion. That said, this fix should make it easier to understand what is going on by unmasking the real issue. * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * test_roundtrip.py and n3roundtrip suite add unbound name test The new test graph will produce the UnboundLocalError with the old code that is missing the name = '' assignment. The new code correctly produces the xfail ValueError when trying to convert to xml. Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Iwan Aucamp <aucampia@gmail.com>
* feat: add namespace_manager argument for n3 method on Paths (#2174)Matt Goldberg2022-12-141-0/+73
| | | | | | | | | | | | | | * Add the ability to pass a NamespaceManager to the n3 method on Paths just like for Terms * chore: add some more type hints and ignores Sadly the __mul__ dunder is not defined in a way that mypy can find it, so there are some type errors that arise from using it. I added `type: ignore` comments for those. I also added some more type hints, which while not strictly necessary, does contribute to more complete type hint coverage. Co-authored-by: Iwan Aucamp <aucampia@gmail.com>
* Fix type errors resulting from new mypy (#2161)Iwan Aucamp2022-11-191-1/+2
| | | | | | New mypy version is reporting new errors. In the long run we need to switch to poetry so we can better control this.
* fix: add charset encoding to SPARQLConnector.update() request. (#2112)Robert Casties2022-09-152-9/+32
| | | | | Add encoding "charset=UTF-8" to Content-Type header in `SPARQLConnector.update()` request. Fixes #2095
* chore: rename default branch to `main` (#2101)Iwan Aucamp2022-09-042-2/+2
| | | | | | | | | | | | | | | | We are still using a somewhat outmoded name for our default branch, this PR captures the decision to change it as a decision record and prepares the rest of the repo for this change. Once merged, the main branch of RDFLib will be renamed using the procedure documented [here](https://github.com/github/renaming). Other changes: - Add area for decision records (this may be merged in another PR before this one). - Remove duplicated sections from `docs/upgrade4to5.rst` as they cause problems when using `sphinx.ext.autosectionlabel` and serve no purpose.
* test: add test for issue #2011 (#2107)Miel Vander Sande2022-09-041-0/+34
| | | Add an xfail test to reproduce issue #2011, confirmed with both pyoxigraph and Jena.
* test: correct a typo in test_roundtrip.py (#2100)Felix Yan2022-08-261-1/+1
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* feat: add type hints to `rdflib.query` and related (#2097)Iwan Aucamp2022-08-246-18/+25
| | | | | | | Add type hints to `rdflib.query` and result format implementations, also add/adjust ignores and type hints in other modules to accommodate the changes. This does not include any runtime changes.
* fix: issue with trig reference counting across graphs (#2085)Iwan Aucamp2022-08-242-23/+83
| | | | | | | | | | | | | | | | | | | | | The TriG serializer was only considering BNode references inside a single graph and not counting the BNodes subjects as references when considering if a BNode should be serialized as unlabeled blank nodes (i.e. `[ ]`), and as a result it was serializing BNodes as unlabeled if they were in fact referencing BNodes in other graphs. One caveat of this change is that some RDF Datasets may be serialized less succinctly in that unlabeled blank nodes would not be used nodes where it is technically possible to use them. This can be trivially fixed, but a trivial fix increases the computational complexity of serialization significantly. Other changes: - Removed the roundtrip xfail that this change fixed. - Added another roundtrip test which has various combinations of BNode references across graphs in a dataset, this test fails for JSON-LD however, so while this change removes one xfail it also now adds another. - Set the default indent_size and style in `.editorconfig` as to avoid relying on undefined system defaults.
* fix: Don't register berkelydb as a store if it is not available on the ↵Clay G2022-08-231-3/+0
| | | | | | | | | system (#2096) This is so that it is simpler and easier to do something with all plugins without treating different plugins in different ways. Also remove test code that tries to accommodate the plugin being present but not usable. Fixes #1816
* feat: add type hints to `rdflib.plugins.sparql.{algebra,operators}` (#2094)Iwan Aucamp2022-08-232-96/+96
| | | | | | | | | | | | | More or less complete type hints for `rdflib.plugins.sparql.algebra` and `rdflib.plugins.sparql.operators`. This does not change runtime behaviour. Other changes: - Fixed line endings of `test/test_issues/test_issue1043.py` and `test/test_issues/test_issue910.py`. - Removed a type hint comment that was present in rdflib/plugins/sparql/algebra.py This is split-off from https://github.com/RDFLib/rdflib/pull/1850.
* test: content-type handling with SPARQLStore + CONSTRUCT queries (#2092)Iwan Aucamp2022-08-234-38/+157
| | | | | | Confirm various content type values are handled correctly with CONSTRUCT queries and SPARQLStore. This aims to confirm that #1195 is fixed.
* test: convert more test from unittest to pytest (#2089)Iwan Aucamp2022-08-234-73/+52
| | | Fairly straight forward conversions with minimal changes.
* feat: Add type hints to rdflib.graph (#2080)Iwan Aucamp2022-08-235-18/+51
| | | | | | | | | | | | More or less complete type hints for the rdflib.graph module. Other changes: - Improved/simplified type hints in `rdflib.store` and store plugins. - Add type ignores for various type errors that occur with the type hints. This is split-off from <https://github.com/RDFLib/rdflib/pull/1850>. This PR does not change runtime behaviour.
* fix: generate VALUES block for federated queries with variables only (#2084)Veyndan Stuart2022-08-211-0/+36
| | | | | | | | Fixed the generation of VALUES block for federated queries. The values block was including non-variable values like BNodes which resulted in invalid queries. Closes #2079.
* fix: handling of Literal datatype (#2076)Iwan Aucamp2022-08-123-11/+137
| | | | | | | | | | | | | | | | | | Check datatype against `None` instead of checking it's truthiness (i.e. `if datatype is not None:` instead of `if datatype:`). Checking truthiness instead of `is not None` causes a blank string to be treated the same as None. The consequence of this was that `Literal.datatype` could be a `str`, a `URIRef` or `None`, instead of just a `URIRef` or `None` as was seemingly intended. Other changes: - Changed the type of `Literal.datatype` to be `Optional[URIRef]` instead of `Optional[str]` now that `str` will always be converted to `URIRef` even if it is a blank string. - Changed `rdflib.util._coalesce` to make it easier and safer to use with a non-`None` default value. - Changed `rdflib.util` to avoid issues with circular imports.
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