diff --git a/daps-xslt/contrib/change-products-on-assembly.xsl b/daps-xslt/contrib/change-products-on-assembly.xsl
new file mode 100644
index 000000000..601727cc6
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+++ b/daps-xslt/contrib/change-products-on-assembly.xsl
@@ -0,0 +1,165 @@
+<!--
+   Purpose:
+     Changes the <meta name="productname"> content of an assembly file
+
+   Parameters:
+     * structure.id: The ID of the structure (<structure xml:id="ID">) to process.
+                     Only needed if more than one structure is available in the assembly file.
+                     Creates an error if more than one structure is there, but no structure.id is set.
+     * version:      The version to add or remove in <productname version="...">
+                     If not set, the stylesheet does NOT continue
+     * product:      The product to add or remove in <productname version="...">...</productname>
+                     If not set, the stylesheet does NOT continue
+     * op:           The operation to execute:
+                     - "add", "a": adds the respective structure to <meta name="productname">
+                     - "remove", "rm", "r": removes the respective structure from <meta name="productname">
+
+   Additional hints:
+     Entities are resolved. If you need to preserve them, protect them first!
+
+   Input:
+     DocBook assembly document with a <meta name="productname"> element
+
+   Output:
+     A DocBook assembly document with changed metadata content in <meta name="productname">
+
+   Author:    Tom Schraitle <toms@opensuse.org>
+   Date:      2025, Jan
+
+-->
+<xsl:stylesheet version="1.0"
+  xmlns="http://docbook.org/ns/docbook"
+  xmlns:d="http://docbook.org/ns/docbook"
+  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+  <xsl:output method="xml" indent="no"/>
+
+  <xsl:key name="id" match="*" use="@xml:id"/>
+
+  <xsl:preserve-space elements="d:meta d:screen"/>
+
+  <!--
+    ### XSLT Parameters
+  -->
+  <!-- The ID of the structure (<structure xml:id="ID">) to process. -->
+  <xsl:param name="structure.id" />
+
+  <!-- The version to add or remove in <productname version="..."> -->
+  <xsl:param name="version">
+    <xsl:message terminate="yes">XSLT Parameter 'version' not set</xsl:message>
+  </xsl:param>
+
+  <!-- The product to add or remove in <productname version="..."> -->
+  <xsl:param name="product">
+    <xsl:message terminate="yes">XSLT Parameter 'product' not set</xsl:message>
+  </xsl:param>
+
+  <!-- Operation to execute: "add" or "remove" -->
+  <xsl:param name="op">
+    <xsl:message terminate="yes">XSLT Parameter 'op' not set</xsl:message>
+  </xsl:param>
+
+  <!-- The separator for meta.add.products and meta.remove.products to separate products
+       from each other
+  -->
+  <xsl:param name="sep">;</xsl:param>
+
+  <!--
+    ### Templates
+  -->
+  <!-- Default: copy all nodes if no specific template exists -->
+  <xsl:template match="node() | @*">
+    <xsl:copy>
+      <xsl:apply-templates select="@* | node()" />
+    </xsl:copy>
+  </xsl:template>
+
+
+  <xsl:template match="/*[not(self::d:assembly)]" priority="1">
+    <xsl:message terminate="yes">ERROR: This document is NOT an assembly file</xsl:message>
+  </xsl:template>
+
+
+  <xsl:template match="/d:assembly[count(d:structure) > 1]">
+    <xsl:choose>
+      <xsl:when test="$structure.id = ''">
+        <xsl:message terminate="yes">
+          <xsl:text>ERROR: The document contains more than one structure.&#10;</xsl:text>
+          <xsl:text>Choose the structure you want to change with the XSLT parameter `structure.id'. Either:&#10;</xsl:text>
+          <xsl:text>1. Use the ID of the structure: structure.id="ID"&#10;</xsl:text>
+          <xsl:text>2. Use structure.id='#all' to change all &lt;structure>s in the assembly.</xsl:text>
+        </xsl:message>
+      </xsl:when>
+      <xsl:when test="$structure.id = '#all'">
+        <xsl:apply-templates />
+      </xsl:when>
+      <xsl:when test="count(key('id', $structure.id))">
+        <xsl:message terminate="yes">
+          <xsl:text>ERROR: ID '</xsl:text>
+          <xsl:value-of select="$structure.id"/>
+          <xsl:text>' not found in assembly.</xsl:text>
+        </xsl:message>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:message>INFO: Selecting structure <xsl:value-of select="concat('&quot;', $structure.id, '&quot;')"/></xsl:message>
+        <xsl:apply-templates select="node()[self::d:structure[@xml:id != $structure.id]]" />
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:template>
+
+
+  <xsl:template match="d:structure[d:merge[count(d:meta[@name = 'productname']) = 0]]" priority="1">
+    <xsl:message>WARNING: No &lt;meta name="productname"> found in structure<xsl:value-of
+      select="concat('[@xml:id=&quot;', @xml:id, '&quot;]')"/></xsl:message>
+    <xsl:apply-templates />
+  </xsl:template>
+
+
+  <xsl:template match="d:meta[@name = 'productname']">
+    <xsl:variable name="productnames" select="d:productname[@version = $version][normalize-space(.) = $product]"/>
+    <xsl:variable name="op-norm">
+      <xsl:choose>
+        <xsl:when test="$op = 'a'">add</xsl:when>
+        <xsl:when test="$op = 'r'">remove</xsl:when>
+        <xsl:when test="$op = 'rm'">remove</xsl:when>
+        <xsl:otherwise><xsl:value-of select="$op"/></xsl:otherwise>
+      </xsl:choose>
+    </xsl:variable>
+    <xsl:message>INFO: Found &lt;meta name="productname"></xsl:message>
+    <xsl:message>INFO: Found productnames for
+      version = <xsl:value-of select="$version"/>
+      product = <xsl:value-of select="$product"/>
+      => <xsl:value-of select="count($productnames)"/>
+    </xsl:message>
+    <xsl:copy>
+      <xsl:apply-templates select="@*" />
+      <xsl:choose>
+        <xsl:when test="$op-norm = 'add' and count($productnames) = 0">
+          <xsl:message>INFO: Adding &lt;productname version="<xsl:value-of
+            select="$version"/>"><xsl:value-of select="$product"/>&lt;/productname></xsl:message>
+          <xsl:apply-templates />
+          <productname version="{$version}"><xsl:value-of select="normalize-space($product)"/></productname>
+          <xsl:text>&#10;</xsl:text>
+        </xsl:when>
+        <xsl:when test="$op-norm = 'add' and count($productnames) != 0">
+          <xsl:message>WARNING: The &lt;productname version="<xsl:value-of
+            select="$version"/>"><xsl:value-of select="$product"/>&lt;/productname> already exists</xsl:message>
+          <xsl:apply-templates />
+        </xsl:when>
+        <xsl:when test="$op-norm = 'remove' and count($productnames) = 0">
+          <xsl:message>WARNING: Cannot remove &lt;productname version="<xsl:value-of
+            select="$version"/>"><xsl:value-of select="$product"/>&lt;/productname>; does NOT exist</xsl:message>
+          <xsl:apply-templates />
+        </xsl:when>
+        <xsl:when test="$op-norm = 'remove' and count($productnames) = 1">
+          <xsl:message>INFO: Removing &lt;productname version="<xsl:value-of
+            select="$version"/>"><xsl:value-of select="$product"/>&lt;/productname></xsl:message>
+          <xsl:apply-templates select="*[not(self::productname[@version=$version][normalize-space(.) = $product])]" />
+        </xsl:when>
+        <xsl:otherwise>
+          <xsl:message>Is this correct? Should that be happen?</xsl:message>
+        </xsl:otherwise>
+      </xsl:choose>
+    </xsl:copy>
+  </xsl:template>
+
+</xsl:stylesheet>
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