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diff --git a/src/sisudoc/io_out/rgx_xhtml.d b/src/sisudoc/io_out/rgx_xhtml.d
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+++ b/src/sisudoc/io_out/rgx_xhtml.d
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+/+
+- Name: SisuDoc Spine, Doc Reform [a part of]
+  - Description: documents, structuring, processing, publishing, search
+    - static content generator
+
+  - Author: Ralph Amissah
+    [ralph.amissah@gmail.com]
+
+  - Copyright: (C) 2015 - 2024 Ralph Amissah, All Rights Reserved.
+
+  - License: AGPL 3 or later:
+
+    Spine (SiSU), a framework for document structuring, publishing and
+    search
+
+    Copyright (C) Ralph Amissah
+
+    This program is free software: you can redistribute it and/or modify it
+    under the terms of the GNU AFERO General Public License as published by the
+    Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    This program is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+    more details.
+
+    You should have received a copy of the GNU General Public License along with
+    this program. If not, see [https://www.gnu.org/licenses/].
+
+    If you have Internet connection, the latest version of the AGPL should be
+    available at these locations:
+    [https://www.fsf.org/licensing/licenses/agpl.html]
+    [https://www.gnu.org/licenses/agpl.html]
+
+  - Spine (by Doc Reform, related to SiSU) uses standard:
+    - docReform markup syntax
+      - standard SiSU markup syntax with modified headers and minor modifications
+    - docReform object numbering
+      - standard SiSU object citation numbering & system
+
+  - Homepages:
+    [https://www.sisudoc.org]
+    [https://www.doc-reform.org]
+
+  - Git
+    [https://git.sisudoc.org/]
+
++/
+/++
+  regex: regular expressions used in sisu document parser
++/
+module sisudoc.io_out.rgx_xhtml;
+@safe:
+static template spineRgxXHTML() {
+  static struct RgxXHTML {
+    static ampersand                                = ctRegex!(`[&]`, "m");      // &amp;
+    static quotation                                = ctRegex!(`["]`, "m");      // &quot;
+    static less_than                                = ctRegex!(`[<]`, "m");      // &lt;
+    static greater_than                             = ctRegex!(`[>]`, "m");      // &gt;
+    static line_break                               = ctRegex!(` [\\]{2}`, "m"); // <br />
+  }
+}