Merge branch 'norm-type' of github.com:stac-extensions/mlm into norm-…

…type

CHANGELOG.md

@@ -34,7 +34,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   Otherwise, the amount of `value_scaling` objects should match the number of bands or channels involved in the input.
 
 ### Fixed
-- n/a
+- Fix check of disallowed unknown/undefined `mlm:`-prefixed fields
+  (fixes [#41](https://github.com/stac-extensions/mlm/issues/41)).
 
 ## [v1.3.0](https://github.com/stac-extensions/mlm/tree/v1.3.0)
 

README.md

@@ -352,7 +352,7 @@ unavailable from [Band Statistics][stac-1.1-stats], such as `value`-specific sca
 
 | Field Name | Type   | Description                                                                                                                            |
 |------------|--------|----------------------------------------------------------------------------------------------------------------------------------------|
-| name       | string | **REQUIRED** Name of the band referring to an extended band definition (see [Bands](#bands-and-statistics).                            |
+| name       | string | **REQUIRED** Name of the band referring to an extended band definition (see [Bands](#bands-and-statistics) details).                   |
 | format     | string | The type of expression that is specified in the `expression` property.                                                                 |
 | expression | \*     | An expression compliant with the `format` specified. The expression can be applied to any data type and depends on the `format` given. |
 

best-practices.md

@@ -116,7 +116,7 @@ A potential representation of a STAC Asset could be as follows:
 Furthermore, the STAC Item representing the derived product could also include
 a [Link Object](https://github.com/radiantearth/stac-spec/tree/master/item-spec/item-spec.md#link-object)
 referring back to the MLM definition using `rel: derived_from`, as described in
-[MLM Relation Types](README.md#relation-types). Such a link would like something like the following:
+[MLM Relation Types](README.md#relation-types). Such a link would look something like the following:
 
 ```json
 {

json-schema/schema.json

@@ -314,7 +314,7 @@
       },
       "$comment": "Allow properties not defined by MLM prefix to allow combination with other extensions.",
       "patternProperties": {
-        "^(?!dlm:)": {}
+        "^(?!mlm:)": {}
       },
       "additionalProperties": false
     },

tests/test_schema.py

@@ -27,6 +27,29 @@ def test_mlm_schema(
     assert SCHEMA_URI in validated
 
 
+@pytest.mark.parametrize(
+    "mlm_example",
+    ["item_raster_bands.json"],
+    indirect=True,
+)
+def test_mlm_no_undefined_prefixed_field(
+    mlm_validator: STACValidator,
+    mlm_example: Dict[str, JSON],
+) -> None:
+    mlm_data = copy.deepcopy(mlm_example)
+    mlm_item = pystac.Item.from_dict(mlm_data)
+    pystac.validation.validate(mlm_item, validator=mlm_validator)  # ensure original is valid
+
+    mlm_data["properties"]["mlm:unknown"] = "random"  # type: ignore
+    with pytest.raises(pystac.errors.STACValidationError) as exc:
+        mlm_item = pystac.Item.from_dict(mlm_data)
+        pystac.validation.validate(mlm_item, validator=mlm_validator)
+    assert all(
+        field in str(exc.value.source)
+        for field in ["mlm:unknown", "^(?!mlm:)"]
+    )
+
+
 @pytest.mark.parametrize(
     "mlm_example",
     ["item_raster_bands.json"],