Use BaseSchemaBuilder

Author: stellasia

src/neo4j_graphrag/experimental/pipeline/config/template_pipeline/simple_kg_builder.py

@@ -48,6 +48,7 @@
     NodeType,
     RelationshipType,
     SchemaFromTextExtractor,
+    BaseSchemaBuilder,
 )
 from neo4j_graphrag.experimental.components.text_splitters.base import TextSplitter
 from neo4j_graphrag.experimental.components.text_splitters.fixed_size_splitter import (
@@ -175,7 +176,7 @@ def _get_run_params_for_splitter(self) -> dict[str, Any]:
     def _get_chunk_embedder(self) -> TextChunkEmbedder:
         return TextChunkEmbedder(embedder=self.get_default_embedder())
 
-    def _get_schema(self) -> Union[SchemaBuilder, SchemaFromTextExtractor]:
+    def _get_schema(self) -> BaseSchemaBuilder:
         """
         Get the appropriate schema component based on configuration.
         Return SchemaFromTextExtractor for automatic extraction or SchemaBuilder for manual schema.