Add example to convert between SPDX2 file formats

Signed-off-by: Holger Frydrych <holger.frydrych@tngtech.com>

Author: fholger

examples/spdx2_convert_format.py

@@ -0,0 +1,16 @@
+#  SPDX-FileCopyrightText: 2023 spdx contributors
+#
+#  SPDX-License-Identifier: Apache-2.0
+from os import path
+
+from spdx_tools.spdx.writer.write_anything import write_file
+from spdx_tools.spdx.parser.parse_anything import parse_file
+
+# This example demonstrates how to load an existing SPDX2 file and convert it to a different SPDX2 format
+
+# Provide a path to the input file in tagvalue format
+input_path = path.join(path.dirname(__file__), "..", "tests", "spdx", "data", "SPDXLite.spdx")
+# Parse the original input file
+document = parse_file(input_path)
+# Write to XML file format
+write_file(document, "converted_format.xml")

tests/spdx/examples/test_examples.py

@@ -11,7 +11,7 @@
 def cleanup_output_files():
     yield
 
-    files_to_delete = ["spdx2_to_3.jsonld", "my_spdx_document.spdx.json"]
+    files_to_delete = ["spdx2_to_3.jsonld", "my_spdx_document.spdx.json", "converted_format.xml"]
     for file in files_to_delete:
         output_file = os.path.join(os.path.dirname(__file__), file)
         if os.path.exists(output_file):
@@ -41,3 +41,11 @@ def test_spdx2_document_from_scratch():
 
     output_file = os.path.join(os.path.dirname(__file__), "my_spdx_document.spdx.json")
     assert os.path.exists(output_file)
+
+
+@pytest.mark.usefixtures('cleanup_output_files')
+def test_spdx2_convert_format():
+    run_example("spdx2_convert_format.py")
+
+    output_file = os.path.join(os.path.dirname(__file__), "converted_format.xml")
+    assert os.path.exists(output_file)