Add support to load multiple rdf files

CHANGELOG.md

@@ -2,6 +2,15 @@
 
 All notable changes to the "vscode-sparql-notebook" extension will be documented in this file.
 
+## 0.0.39
+- Oxigraph update
+- Feature: You can load multiple files for "local" queries.
+
+## 0.0.38
+- Oxigraph update
+- Fix: Correct SPARQL select result order
+- Fix: Correct SPARQL optional empty filed rendering
+
 ## 0.0.37
 - Fix: Windows path issue with external query files.
 

README.md

@@ -69,6 +69,24 @@ or
 ```
 Working with relative paths makes the notebook portable.
 
+For file based endpoints you can have multiple files in the endpoint definitions in many ways:
+
+Absolute or relative paths pattern are supported but i suggest to use relative paths for portability.
+```sparql
+# [endpoint=./rdf/{a,b}.ttl]
+```
+or 
+```sparql
+# [endpoint=./rdf/*.ttl]
+```
+or 
+```sparql
+# [endpoint=./rdf/a.ttl]
+# [endpoint=./rdf/b.ttl]
+```
+
+Note: You cannot mix HTTP endpoints and file endpoints in the same cell.
+
 ### Cell Status Bar
 The cell status bar displays information about the endpoint in use and its source.