Merge pull request #196 from linkml/issue-2142

Adding type_mappings to metamodel

Author: cmungall

linkml_model/model/schema/meta.yaml

@@ -464,6 +464,14 @@ slots:
     description: >-
       The relationship between an element and its alias.
 
+  alias_contexts:
+    alias: contexts
+    domain: structured_alias
+    range: uri
+    multivalued: true
+    description: >-
+      The context in which an alias should be applied
+
   in_language:
     slot_uri: schema:inLanguage
     range: string
@@ -2131,6 +2139,27 @@ slots:
     in_subset:
       - SpecificationSubset
 
+  type_mappings:
+    range: type_mapping
+    description: >-
+      A collection of type mappings that specify how a slot's range should be mapped or
+      serialized in different frameworks
+    multivalued: true
+      
+  framework_key:
+    range: string
+    alias: framework
+    key: true
+    description: >-
+      The name of a format that can be used to serialize LinkML data.
+      The string value should be a code from the LinkML frameworks vocabulary,
+      but this is not strictly enforced
+    
+  mapped_type:
+    range: type_definition
+    alias: type
+    description: >-
+      type to coerce to
 
   # -----------------------------------
   # Slots for type definition
@@ -2763,6 +2792,7 @@ classes:
       - literal_form
       - alias_predicate
       - categories
+      - alias_contexts
     slot_usage:
       categories:
         description: >-
@@ -2919,6 +2949,7 @@ classes:
       - disjoint_with
       - children_are_mutually_disjoint
       - union_of
+      - type_mappings
     slot_usage:
       is_a:
         range: slot_definition
@@ -3181,6 +3212,20 @@ classes:
       - BasicSubset
       - RelationalModelProfile
 
+  type_mapping:
+    rank: 21
+    description: Represents how a slot or type can be serialized to a format.
+    mixins:
+      - extensible
+      - annotatable
+      - common_metadata
+    slots:
+      - framework_key
+      - mapped_type
+      - string_serialization
+    in_subset:
+      - SpecificationSubset
+
 # ==================================
 # Enumerations                     #
 # ==================================

tests/input/examples/schema_definition-type_mappings-1.yaml

@@ -0,0 +1,43 @@
+id: https://example.org/serializations
+name: serializations_example
+title: Serializaations Example
+description: |-
+  Example LinkML schema to demonstrate serialization exceptions.
+
+
+prefixes:
+  linkml: https://w3id.org/linkml/
+  example: https://example.org/
+
+default_prefix: example
+
+imports:
+  - linkml:types
+
+classes:
+
+  A:
+    attributes:
+      my_big_integer:
+        range: integer
+        type_mappings:
+          JSON:
+            type: string
+            description: we serialize this as a string because some json implementations may implement as doubles
+          PROTOBUF:
+            type: int64
+      my_date:
+        range: date
+        type_mappings:
+          PYTHON:
+            type: string
+    examples:
+      - object:
+          my_big_integer: 12345678901234567890
+          my_date: 2021-01-01
+
+
+
+
+
+