I imported it for security/libdigidocpp which stopped requiring it some time ago.
There were no other consumers in our tree.

Our 4.1.0 is outdated and unlikely to be updated to the current 4.2.0 unless
someone ports the then required build2 build system for xsd, the successor of the
mess currently contained in xsd itself:

    # xsd uses a bundled version of build:
    # "massively-parallel build system implemented on top of GNU make"
    USE_GMAKE =             Yes
    MAKE_FILE =             makefile
    ALL_TARGET =            # empty


OK to remove?

If by any chance someone needs this again, they can revive (and update) it.

Index: devel/Makefile
===================================================================
RCS file: /cvs/ports/devel/Makefile,v
diff -u -p -r1.2482 Makefile
--- devel/Makefile	25 Mar 2025 11:23:20 -0000	1.2482
+++ devel/Makefile	2 Apr 2025 19:24:22 -0000
@@ -1989,7 +1989,6 @@
      SUBDIR += xdg-user-dirs
      SUBDIR += xdg-utils
      SUBDIR += xmake
-     SUBDIR += xsd
      SUBDIR += xtensa-elf
      SUBDIR += xtensa-esp32-elf
      SUBDIR += xtensa-esp32s2-elf
Index: devel/quirks/Makefile
===================================================================
RCS file: /cvs/ports/devel/quirks/Makefile,v
diff -u -p -r1.1696 Makefile
--- devel/quirks/Makefile	25 Mar 2025 17:17:16 -0000	1.1696
+++ devel/quirks/Makefile	2 Apr 2025 19:25:02 -0000
@@ -3,8 +3,7 @@ CATEGORIES =	devel databases
 DISTFILES =
 
 # API.rev
-PKGNAME =	quirks-7.103
-PKG_ARCH =	*
+PKGNAME =	quirks-7.104
 MAINTAINER =	Marc Espie <espie@openbsd.org>
 
 # BSD
Index: devel/quirks/files/Quirks.pm
===================================================================
RCS file: /cvs/ports/devel/quirks/files/Quirks.pm,v
diff -u -p -r1.1708 Quirks.pm
--- devel/quirks/files/Quirks.pm	25 Mar 2025 17:17:16 -0000	1.1708
+++ devel/quirks/files/Quirks.pm	2 Apr 2025 19:25:43 -0000
@@ -1246,6 +1246,7 @@ setup_obsolete_reason(
 	11 => 'rpki-data',
 	5 => 'pycha',
 	10 => 'gotosocial',
+	5 => 'xsd',
 );
 
 # though it's not yet used, these should be pkgnames, so that eventually