From 472d48d95ea0aa7f59a25d2c4082a5336516f0c2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Mon, 15 Jun 2026 15:15:56 +0200
Subject: [PATCH] Make saxonche dependency optional

---
 README.rst             | 2 ++
 pyproject.toml         | 3 ++-
 src/facturx/facturx.py | 8 +++++++-
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/README.rst b/README.rst
index f27ed87..9487bf9 100644
--- a/README.rst
+++ b/README.rst
@@ -139,6 +139,8 @@ Contributors
 Changelog
 =========
 
+  * Make saxonche dependency optional
+
 * Version 4.3 dated 2026-05-26 (`OCA code sprint Santander <https://www.aeodoo.org/event/spanish-oca-days-2026-143/page/introduccion-spanish-oca-days-2026>`_)
 
   * Restore compatibility with lxml 4.6.5
diff --git a/pyproject.toml b/pyproject.toml
index f24d956..ea2a290 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,13 +22,14 @@ license = {file = "LICENSE.txt"}
 dependencies = [
     "pypdf>=5.3.0",
     "lxml",
-    "saxonche",
 ]
 requires-python = ">=3.9"
 dynamic = ["version"]
 
 [project.optional-dependencies]
+schematron = ["saxonche"]
 test = [
+    "saxonche",
     "pytest",
     "coverage[toml]",
 ]
diff --git a/src/facturx/facturx.py b/src/facturx/facturx.py
index c69809e..d6002b3 100644
--- a/src/facturx/facturx.py
+++ b/src/facturx/facturx.py
@@ -32,7 +32,10 @@
 from io import BytesIO, IOBase
 from tempfile import NamedTemporaryFile
 
-import saxonche
+try:
+    import saxonche
+except ImportError:
+    saxonche = None
 from lxml import etree
 from pypdf import PdfReader, PdfWriter
 from pypdf.generic import (
@@ -242,6 +245,9 @@ def xml_check_schematron(xml, flavor="autodetect", level="autodetect"):
     :return: True if the XML is valid against the schematron
     raise an error if it is not valid against the schematron
     """
+    if not saxonche:
+        logger.info("Missing saxonche module, schematron validation skipped")
+        return True
     logger.debug("xml_check_schematron with factur-x lib %s", VERSION)
     if not isinstance(flavor, str):
         raise ValueError("Wrong type for flavor argument")