docs: def get_schema(self, path, with_refs=False, resolved=False):
          """Retrieve a schema.
  
          :param path: schema's relative path.
          :param with_refs: replace $refs in the schema.
          :param resolved: resolve schema using the resolver
              :py:const:`invenio_jsonschemas.config.JSONSCHEMAS_RESOLVER_CLS`
          :raises invenio_jsonschemas.errors.JSONSchemaNotFound: If no schema
              was found in the specified path.
          :returns: The schema in a dictionary form.
          """
          if path not in self.schemas:
              raise JSONSchemaNotFound(path)
          with open(os.path.join(self.schemas[path], path)) as file_:
              schema = json.load(file_)
              if with_refs:
                  schema = JsonRef.replace_refs(
                      schema,
                      base_uri=request.base_url,
                      loader=self.loader_cls() if self.loader_cls else None,
                  )
              if resolved:
                  schema = self.resolver_cls(schema)
              return schema