RO-Crate version selector

README.md

@@ -1,6 +1,6 @@
 [![Python package](https://github.com/ResearchObject/ro-crate-py/workflows/Python%20package/badge.svg)](https://github.com/ResearchObject/ro-crate-py/actions?query=workflow%3A%22Python+package%22) [![Upload Python Package](https://github.com/ResearchObject/ro-crate-py/workflows/Upload%20Python%20Package/badge.svg)](https://github.com/ResearchObject/ro-crate-py/actions?query=workflow%3A%22Upload+Python+Package%22) [![PyPI version](https://badge.fury.io/py/rocrate.svg)](https://pypi.org/project/rocrate/) [![DOI](https://zenodo.org/badge/216605684.svg)](https://zenodo.org/badge/latestdoi/216605684)
 
-ro-crate-py is a Python library to create and consume [Research Object Crates](https://w3id.org/ro/crate). It currently supports the [RO-Crate 1.1](https://w3id.org/ro/crate/1.1) specification.
+ro-crate-py is a Python library to create and consume [Research Object Crates](https://w3id.org/ro/crate). It supports the current [RO-Crate 1.2](https://w3id.org/ro/crate/1.2) specification as well as the older [RO-Crate 1.1](https://w3id.org/ro/crate/1.1) and [RO-Crate 1.0](https://w3id.org/ro/crate/1.0).
 
 ## Installation
 
@@ -225,6 +225,25 @@ Note that entities can have multiple types, e.g.:
     "@type" = ["File", "SoftwareSourceCode"]
 ```
 
+#### Selecting the RO-Crate specification version
+
+By default, a newly created RO-Crate conforms to the [RO-Crate 1.2](https://w3id.org/ro/crate/1.2) specification, but 1.0 and 1.1 are still supported:
+
+```pycon
+>>> from rocrate.rocrate import ROCrate
+>>> crate = ROCrate()
+>>> crate.version
+'1.2'
+>>> crate = ROCrate(version="1.0")
+>>> crate.version
+'1.0'
+>>> crate.metadata.id
+'ro-crate-metadata.jsonld'
+```
+
+When consuming an RO-Crate (see below), the `version` parameter is ignored, and the RO-Crate version is read from the metadata descriptor instead.
+
+
 ### Consuming an RO-Crate
 
 An existing RO-Crate package can be loaded from a directory or zip file:

rocrate/metadata.py

@@ -23,7 +23,7 @@
 import json
 import warnings
 
-from .model import Metadata, LegacyMetadata
+from .model.metadata import BASENAME, LEGACY_BASENAME
 
 
 def read_metadata(metadata_path):
@@ -85,13 +85,13 @@ def find_root_entity_id(entities):
     is more than one, we just return an arbitrary pair.
 
     """
-    descriptor = entities.get(Metadata.BASENAME, entities.get(LegacyMetadata.BASENAME))
+    descriptor = entities.get(BASENAME, entities.get(LEGACY_BASENAME))
     if descriptor:
         return _check_descriptor(descriptor, entities)
     candidates = []
     for id_, e in entities.items():
         basename = id_.rsplit("/", 1)[-1]
-        if basename == Metadata.BASENAME or basename == LegacyMetadata.BASENAME:
+        if basename == BASENAME or basename == LEGACY_BASENAME:
             try:
                 candidates.append(_check_descriptor(e, entities))
             except ValueError:

rocrate/model/__init__.py

@@ -38,7 +38,7 @@
 from .entity import Entity
 from .file import File
 from .file_or_dir import FileOrDir
-from .metadata import Metadata, LegacyMetadata
+from .metadata import Metadata
 from .person import Person
 from .root_dataset import RootDataset
 from .softwareapplication import SoftwareApplication
@@ -58,7 +58,6 @@
     "Entity",
     "File",
     "FileOrDir",
-    "LegacyMetadata",
     "Metadata",
     "Person",
     "Preview",

rocrate/model/metadata.py

@@ -29,19 +29,25 @@
 from .dataset import Dataset
 
 
+SUPPORTED_VERSIONS = {"1.0", "1.1", "1.2"}
+DEFAULT_VERSION = "1.2"
+BASENAME = "ro-crate-metadata.json"
+LEGACY_BASENAME = "ro-crate-metadata.jsonld"
+
 WORKFLOW_PROFILE = "https://w3id.org/workflowhub/workflow-ro-crate/1.0"
 
 
 class Metadata(File):
     """\
     RO-Crate metadata file.
     """
-    BASENAME = "ro-crate-metadata.json"
-    PROFILE = "https://w3id.org/ro/crate/1.1"
-
-    def __init__(self, crate, source=None, dest_path=None, properties=None):
+    def __init__(self, crate, source=None, dest_path=None, properties=None, version=DEFAULT_VERSION):
+        if version not in SUPPORTED_VERSIONS:
+            raise ValueError(f"version {version!r} not supported")
+        self.version = version
+        self.profile = f"https://w3id.org/ro/crate/{self.version}"
         if source is None and dest_path is None:
-            dest_path = self.BASENAME
+            dest_path = LEGACY_BASENAME if version == "1.0" else BASENAME
         super().__init__(
             crate,
             source=source,
@@ -58,7 +64,7 @@ def _empty(self):
         # default properties of the metadata entry
         val = {"@id": self.id,
                "@type": "CreativeWork",
-               "conformsTo": {"@id": self.PROFILE},
+               "conformsTo": {"@id": self.profile},
                "about": {"@id": "./"}}
         return val
 
@@ -68,7 +74,7 @@ def generate(self):
         graph = []
         for entity in self.crate.get_entities():
             graph.append(entity.properties())
-        context = [f'{self.PROFILE}/context']
+        context = [f'{self.profile}/context']
         context.extend(self.extra_contexts)
         if self.extra_terms:
             context.append(self.extra_terms)
@@ -92,12 +98,6 @@ def root(self) -> Dataset:
         return self.crate.root_dataset
 
 
-class LegacyMetadata(Metadata):
-
-    BASENAME = "ro-crate-metadata.jsonld"
-    PROFILE = "https://w3id.org/ro/crate/1.0"
-
-
 # https://github.com/ResearchObject/ro-terms/tree/master/test
 TESTING_EXTRA_TERMS = {
     "TestSuite": "https://w3id.org/ro/terms/test#TestSuite",
@@ -114,13 +114,3 @@ class LegacyMetadata(Metadata):
     "definition": "https://w3id.org/ro/terms/test#definition",
     "engineVersion": "https://w3id.org/ro/terms/test#engineVersion"
 }
-
-
-def metadata_class(descriptor_id):
-    basename = descriptor_id.rsplit("/", 1)[-1]
-    if basename == Metadata.BASENAME:
-        return Metadata
-    elif basename == LegacyMetadata.BASENAME:
-        return LegacyMetadata
-    else:
-        raise ValueError(f"Invalid metadata descriptor ID: {descriptor_id!r}")

rocrate/rocrate.py

@@ -43,7 +43,6 @@
     Entity,
     File,
     FileOrDir,
-    LegacyMetadata,
     Metadata,
     Preview,
     RootDataset,
@@ -54,7 +53,7 @@
     TestSuite,
     WorkflowDescription,
 )
-from .model.metadata import WORKFLOW_PROFILE, TESTING_EXTRA_TERMS, metadata_class
+from .model.metadata import WORKFLOW_PROFILE, TESTING_EXTRA_TERMS, DEFAULT_VERSION, BASENAME, LEGACY_BASENAME
 from .model.computationalworkflow import galaxy_to_abstract_cwl
 from .model.computerlanguage import get_lang
 from .model.testservice import get_service
@@ -76,9 +75,17 @@ def pick_type(json_entity, type_map, fallback=None):
     return fallback
 
 
+def get_version(metadata_properties):
+    for uri in get_norm_value(metadata_properties, "conformsTo"):
+        base_uri, version = uri.rsplit("/", 1)
+        if base_uri.startswith("https://w3id.org/ro/crate"):
+            return version
+    return None
+
+
 class ROCrate():
 
-    def __init__(self, source=None, gen_preview=False, init=False, exclude=None):
+    def __init__(self, source=None, gen_preview=False, init=False, exclude=None, version=DEFAULT_VERSION):
         self.mode = None
         self.source = source
         self.exclude = exclude
@@ -92,7 +99,7 @@ def __init__(self, source=None, gen_preview=False, init=False, exclude=None):
             self.add(Preview(self))
         if not source:
             self.mode = Mode.CREATE
-            self.add(RootDataset(self), Metadata(self))
+            self.add(RootDataset(self), Metadata(self, version=version))
         elif init:
             self.mode = Mode.INIT
             if isinstance(source, dict):
@@ -104,19 +111,19 @@ def __init__(self, source=None, gen_preview=False, init=False, exclude=None):
         # in the zip case, self.source is the extracted dir
         self.source = source
 
-    def __init_from_tree(self, top_dir, gen_preview=False):
+    def __init_from_tree(self, top_dir, gen_preview=False, version=DEFAULT_VERSION):
         top_dir = Path(top_dir)
         if not top_dir.is_dir():
             raise NotADirectoryError(errno.ENOTDIR, f"'{top_dir}': not a directory")
-        self.add(RootDataset(self), Metadata(self))
+        self.add(RootDataset(self), Metadata(self, version=version))
         for root, dirs, files in walk(top_dir, exclude=self.exclude):
             root = Path(root)
             for name in dirs:
                 source = root / name
                 self.add_dataset(source, source.relative_to(top_dir))
             for name in files:
                 source = root / name
-                if source == top_dir / Metadata.BASENAME or source == top_dir / LegacyMetadata.BASENAME:
+                if source == top_dir / BASENAME or source == top_dir / LEGACY_BASENAME:
                     continue
                 if source != top_dir / Preview.BASENAME:
                     self.add_file(source, source.relative_to(top_dir))
@@ -136,11 +143,11 @@ def __read(self, source, gen_preview=False):
                 with zipfile.ZipFile(source, "r") as zf:
                     zf.extractall(zip_path)
                 source = Path(zip_path)
-            metadata_path = source / Metadata.BASENAME
+            metadata_path = source / BASENAME
             if not metadata_path.is_file():
-                metadata_path = source / LegacyMetadata.BASENAME
+                metadata_path = source / LEGACY_BASENAME
             if not metadata_path.is_file():
-                raise ValueError(f"Not a valid RO-Crate: missing {Metadata.BASENAME}")
+                raise ValueError(f"Not a valid RO-Crate: missing {BASENAME}")
         _, entities = read_metadata(metadata_path)
         self.__read_data_entities(entities, source, gen_preview)
         self.__read_contextual_entities(entities)
@@ -154,9 +161,9 @@ def __read_data_entities(self, entities, source, gen_preview):
         assert root_id == root_entity.pop('@id')
         parts = as_list(root_entity.pop('hasPart', []))
         self.add(RootDataset(self, root_id, properties=root_entity))
-        MetadataClass = metadata_class(metadata_id)
         metadata_properties = entities.pop(metadata_id)
-        self.add(MetadataClass(self, metadata_id, properties=metadata_properties))
+        version = get_version(metadata_properties) or DEFAULT_VERSION
+        self.add(Metadata(self, metadata_id, properties=metadata_properties, version=version))
 
         preview_entity = entities.pop(Preview.BASENAME, None)
         if preview_entity and not gen_preview:
@@ -198,18 +205,18 @@ def __read_contextual_entities(self, entities):
     @property
     def default_entities(self):
         return [e for e in self.__entity_map.values()
-                if isinstance(e, (RootDataset, Metadata, LegacyMetadata, Preview))]
+                if isinstance(e, (RootDataset, Metadata, Preview))]
 
     @property
     def data_entities(self):
         return [e for e in self.__entity_map.values()
-                if not isinstance(e, (RootDataset, Metadata, LegacyMetadata, Preview))
+                if not isinstance(e, (RootDataset, Metadata, Preview))
                 and hasattr(e, "write")]
 
     @property
     def contextual_entities(self):
         return [e for e in self.__entity_map.values()
-                if not isinstance(e, (RootDataset, Metadata, LegacyMetadata, Preview))
+                if not isinstance(e, (RootDataset, Metadata, Preview))
                 and not hasattr(e, "write")]
 
     @property
@@ -300,6 +307,10 @@ def mainEntity(self):
     def mainEntity(self, value):
         self.root_dataset['mainEntity'] = value
 
+    @property
+    def version(self):
+        return self.metadata.version
+
     @property
     def test_dir(self):
         rval = self.dereference("test")
@@ -417,7 +428,7 @@ def add(self, *entities):
             key = e.canonical_id()
             if isinstance(e, RootDataset):
                 self.root_dataset = e
-            elif isinstance(e, (Metadata, LegacyMetadata)):
+            elif isinstance(e, Metadata):
                 self.metadata = e
             elif isinstance(e, Preview):
                 self.preview = e

test/conftest.py

@@ -21,24 +21,22 @@
 # limitations under the License.
 
 import json
-import pathlib
 import shutil
+from pathlib import Path
 
 import pytest
 from rocrate.utils import get_norm_value
 
 
-THIS_DIR = pathlib.Path(__file__).absolute().parent
+THIS_DIR = Path(__file__).absolute().parent
 TEST_DATA_NAME = 'test-data'
 BASE_URL = 'https://w3id.org/ro/crate'
-VERSION = '1.1'
+DEFAULT_VERSION = '1.2'
 LEGACY_VERSION = '1.0'
 
 
 class Helpers:
 
-    PROFILE = f"{BASE_URL}/{VERSION}"
-    LEGACY_PROFILE = f"{BASE_URL}/{LEGACY_VERSION}"
     WORKFLOW_PROFILE = "https://w3id.org/workflowhub/workflow-ro-crate/1.0"
     METADATA_FILE_NAME = 'ro-crate-metadata.json'
     LEGACY_METADATA_FILE_NAME = 'ro-crate-metadata.jsonld'
@@ -49,20 +47,23 @@ class Helpers:
 
     @classmethod
     def read_json_entities(cls, crate_base_path):
-        metadata_path = pathlib.Path(crate_base_path) / cls.METADATA_FILE_NAME
+        crate_base_path = Path(crate_base_path)
+        metadata_path = crate_base_path / cls.METADATA_FILE_NAME
+        if not metadata_path.is_file():
+            metadata_path = crate_base_path / cls.LEGACY_METADATA_FILE_NAME
         with open(metadata_path, "rt") as f:
             json_data = json.load(f)
         return {_["@id"]: _ for _ in json_data["@graph"]}
 
     @classmethod
-    def check_crate(cls, json_entities, root_id="./", data_entity_ids=None):
+    def check_crate(cls, json_entities, root_id="./", data_entity_ids=None, version=DEFAULT_VERSION):
         assert root_id in json_entities
         root = json_entities[root_id]
         assert root["@type"] == "Dataset"
         assert cls.METADATA_FILE_NAME in json_entities
         metadata = json_entities[cls.METADATA_FILE_NAME]
         assert metadata["@type"] == "CreativeWork"
-        assert cls.PROFILE in get_norm_value(metadata, "conformsTo")
+        assert f"{BASE_URL}/{version}" in get_norm_value(metadata, "conformsTo")
         assert metadata["about"] == {"@id": root_id}
         if data_entity_ids:
             data_entity_ids = set(data_entity_ids)
@@ -91,7 +92,7 @@ def helpers():
 # pytest's default tmpdir returns a py.path object
 @pytest.fixture
 def tmpdir(tmpdir):
-    return pathlib.Path(tmpdir)
+    return Path(tmpdir)
 
 
 @pytest.fixture

test/test-data/crate-1.0/data.csv

@@ -0,0 +1,3 @@
+name,number
+foo,1
+bar,2

test/test-data/crate-1.0/ro-crate-metadata.jsonld

@@ -0,0 +1,30 @@
+{
+    "@context": "https://w3id.org/ro/crate/1.0/context",
+    "@graph": [
+        {
+            "@id": "ro-crate-metadata.jsonld",
+            "@type": "CreativeWork",
+            "about": {"@id": "./"},
+            "conformsTo": {"@id": "https://w3id.org/ro/crate/1.0"}
+        },
+        {
+            "@id": "./",
+            "@type": "Dataset",
+            "name": "Example crate",
+            "description": "An example RO-Crate",
+            "datePublished": "2025-10-17",
+            "license": {"@id": "http://spdx.org/licenses/CC0-1.0"},
+            "hasPart": [{"@id": "data.csv"}]
+        },
+        {
+            "@id": "data.csv",
+            "@type": "File",
+            "name": "CSV data"
+        },
+        {
+            "@id": "http://spdx.org/licenses/CC0-1.0",
+            "@type": "CreativeWork",
+            "name": "CC0-1.0"
+        }
+    ]
+}

test/test-data/crate-1.1/data.csv

@@ -0,0 +1,3 @@
+name,number
+foo,1
+bar,2