From a1495c8d7fe1c6e94c146d0c7c69667c985d8db5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adam=20Zieli=C5=84ski?= <adam@adamziel.com>
Date: Sun, 2 Nov 2025 16:19:46 +0100
Subject: [PATCH] [XMLProcessor] Tolerate standalone="true"

---
 components/XML/Tests/W3CXMLConformanceTest.php | 12 +-----------
 components/XML/class-xmlprocessor.php          |  8 --------
 2 files changed, 1 insertion(+), 19 deletions(-)

diff --git a/components/XML/Tests/W3CXMLConformanceTest.php b/components/XML/Tests/W3CXMLConformanceTest.php
index 012f6686..e5b09101 100644
--- a/components/XML/Tests/W3CXMLConformanceTest.php
+++ b/components/XML/Tests/W3CXMLConformanceTest.php
@@ -59,21 +59,11 @@ public function test_w3c_xml_test_case($test_id, $test_type, $test_file, $descri
 		}
 
 		if (in_array($test_id, [
-			"not-sa01",
-			"not-sa02",
-			"not-sa03",
 			"not-sa04",
 			"sa04",
 			"ibm-valid-P01-ibm01v01.xml",
-			"ibm-valid-P32-ibm32v01.xml",
-			"ibm-valid-P32-ibm32v02.xml",
-			"ibm-valid-P32-ibm32v03.xml",
-			"ibm-valid-P32-ibm32v04.xml",
-			"ibm-valid-P68-ibm68v02.xml",
-			"ibm-valid-P69-ibm69v01.xml",
-			"ibm-valid-P69-ibm69v02.xml",
 		])) {
-			$this->markTestSkipped("Skipping test case: {$test_id} – XMLProcessor does not support standalone documents");
+			$this->markTestSkipped("Skipping test case: {$test_id} – XMLProcessor does not support custom processing directive targets (e.g. <?music ... ?>)");
 			return;
 		}
 
diff --git a/components/XML/class-xmlprocessor.php b/components/XML/class-xmlprocessor.php
index 772cb7b5..9ddea8ae 100644
--- a/components/XML/class-xmlprocessor.php
+++ b/components/XML/class-xmlprocessor.php
@@ -21,7 +21,6 @@
  * – XML 1.0
  * – Well-formed
  * – UTF-8 encoded
- * – Not standalone (so can use external entities)
  * – No external DTD subset expansion (external entities may exist but are not fetched).
  *
  * XML 1.1 is explicitly not a design goal here. Version 1.1 is
@@ -2073,13 +2072,6 @@ private function parse_next_tag() {
 					return false;
 				}
 
-				if ( null !== $this->get_qualified_attribute( 'standalone' )
-					&& 'YES' !== strtoupper( $this->get_qualified_attribute( 'standalone' ) )
-				) {
-					$this->bail( 'Standalone XML documents are not supported.', self::ERROR_UNSUPPORTED );
-					return false;
-				}
-
 				$at = $this->bytes_already_parsed;
 
 				// Skip whitespace.