--- a/svghmi/analyse_widget.xslt	Wed Nov 23 11:30:30 2022 +0100
+++ b/svghmi/analyse_widget.xslt	Wed Nov 23 11:34:15 2022 +0100
@@ -854,6 +854,46 @@
       <xsl:text>Value to display</xsl:text>
     </path>
   </xsl:template>
+  <xsl:template match="widget[@type='Page']" mode="widget_desc">
+    <type>
+      <xsl:value-of select="@type"/>
+    </type>
+    <longdesc>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>Arguments are either:
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>- XXX reference path TODO
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>- name=value: setting variable with literal value.
+</xsl:text>
+      <xsl:text>- name=other_name: copy variable content into another
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>"active"+"inactive" labeled elements can be provided to show feedback when pressed
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>Exemples:
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>HMI:Page:notify=1@notify=/PLCVAR
+</xsl:text>
+      <xsl:text>HMI:Page:ack=2:notify=1@ack=.local_var@notify=/PLCVAR
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+    </longdesc>
+    <shortdesc>
+      <xsl:text>Page </xsl:text>
+    </shortdesc>
+  </xsl:template>
   <xsl:template match="widget[@type='PathSlider']" mode="widget_desc">
     <type>
       <xsl:value-of select="@type"/>

--- a/svghmi/gen_index_xhtml.xslt	Wed Nov 23 11:30:30 2022 +0100
+++ b/svghmi/gen_index_xhtml.xslt	Wed Nov 23 11:34:15 2022 +0100
@@ -734,6 +734,21 @@
   </func:function>
   <xsl:variable name="_detachable_elements" select="func:detachable_elements($hmi_pages | $keypads)"/>
   <xsl:variable name="detachable_elements" select="$_detachable_elements[not(ancestor::*/@id = $_detachable_elements/@id)]"/>
+  <declarations:page-class/>
+  <xsl:template match="declarations:page-class">
+    <xsl:text>
+</xsl:text>
+    <xsl:text>/* </xsl:text>
+    <xsl:value-of select="local-name()"/>
+    <xsl:text> */
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+    <xsl:text>class PageWidget extends Widget{}
+</xsl:text>
+    <xsl:text>
+</xsl:text>
+  </xsl:template>
   <declarations:detachable-elements/>
   <xsl:template match="declarations:detachable-elements">
     <xsl:text>
@@ -787,7 +802,15 @@
     <xsl:variable name="page_all_elements" select="func:all_related_elements($page)"/>
     <xsl:variable name="all_page_widgets" select="$hmi_widgets[@id = $page_all_elements/@id and @id != $page/@id]"/>
     <xsl:variable name="page_managed_widgets" select="$all_page_widgets[not(@id=$in_forEach_widget_ids)]"/>
-    <xsl:variable name="page_relative_widgets" select="$page_managed_widgets[func:is_descendant_path(func:widget(@id)/path/@value, $desc/path/@value)]"/>
+    <xsl:variable name="page_root_path" select="$desc/path[not(@assign)]"/>
+    <xsl:if test="count($page_root_path)&gt;1">
+      <xsl:message terminate="yes">
+        <xsl:text>Page id="</xsl:text>
+        <xsl:value-of select="$page/@id"/>
+        <xsl:text>" : only one root path can be declared</xsl:text>
+      </xsl:message>
+    </xsl:if>
+    <xsl:variable name="page_relative_widgets" select="$page_managed_widgets[func:is_descendant_path(func:widget(@id)/path/@value, $page_root_path/@value)]"/>
     <xsl:variable name="sumarized_page" select="func:sumarized_elements($page_all_elements)"/>
     <xsl:variable name="required_detachables" select="$sumarized_page/&#10;           ancestor-or-self::*[@id = $detachable_elements/@id]"/>
     <xsl:text>  "</xsl:text>
@@ -804,31 +827,35 @@
     <xsl:value-of select="$p/@h"/>
     <xsl:text>],
 </xsl:text>
-    <xsl:if test="$desc/path/@value">
-      <xsl:if test="count($desc/path/@index)=0">
+    <xsl:if test="count($page_root_path)=1">
+      <xsl:if test="count($page_root_path/@index)=0">
         <xsl:message terminate="no">
           <xsl:text>Page id="</xsl:text>
           <xsl:value-of select="$page/@id"/>
           <xsl:text>" : No match for path "</xsl:text>
-          <xsl:value-of select="$desc/path/@value"/>
+          <xsl:value-of select="$page_root_path/@value"/>
           <xsl:text>" in HMI tree</xsl:text>
         </xsl:message>
       </xsl:if>
       <xsl:text>    page_index: </xsl:text>
-      <xsl:value-of select="$desc/path/@index"/>
+      <xsl:value-of select="$page_root_path/@index"/>
       <xsl:text>,
 </xsl:text>
       <xsl:text>    page_class: "</xsl:text>
-      <xsl:value-of select="$indexed_hmitree/*[@hmipath = $desc/path/@value]/@class"/>
+      <xsl:value-of select="$indexed_hmitree/*[@hmipath = $page_root_path/@value]/@class"/>
       <xsl:text>",
 </xsl:text>
     </xsl:if>
     <xsl:text>    widgets: [
 </xsl:text>
+    <xsl:text>        [hmi_widgets["</xsl:text>
+    <xsl:value-of select="$page/@id"/>
+    <xsl:text>"], []],
+</xsl:text>
     <xsl:for-each select="$page_managed_widgets">
       <xsl:variable name="widget_paths_relativeness">
         <xsl:for-each select="func:widget(@id)/path">
-          <xsl:value-of select="func:is_descendant_path(@value, $desc/path/@value)"/>
+          <xsl:value-of select="func:is_descendant_path(@value, $page_root_path/@value)"/>
           <xsl:if test="position()!=last()">
             <xsl:text>,</xsl:text>
           </xsl:if>
@@ -1440,7 +1467,7 @@
     <xsl:text>,{
 </xsl:text>
     <xsl:if test="$widget/@enable_expr">
-      <xsl:text>      assignments: [],
+      <xsl:text>      enable_assignments: [],
 </xsl:text>
       <xsl:text>      compute_enable: function(value, oldval, varnum) {
 </xsl:text>
@@ -1456,13 +1483,13 @@
             <xsl:if test="$varid = generate-id()">
               <xsl:text>          if(varnum == </xsl:text>
               <xsl:value-of select="$varnum"/>
-              <xsl:text>) this.assignments[</xsl:text>
+              <xsl:text>) this.enable_assignments[</xsl:text>
               <xsl:value-of select="position()-1"/>
               <xsl:text>] = value;
 </xsl:text>
               <xsl:text>          let </xsl:text>
               <xsl:value-of select="@assign"/>
-              <xsl:text> = this.assignments[</xsl:text>
+              <xsl:text> = this.enable_assignments[</xsl:text>
               <xsl:value-of select="position()-1"/>
               <xsl:text>];
 </xsl:text>
@@ -2388,7 +2415,9 @@
     </xsl:message>
   </xsl:template>
   <xsl:variable name="included_ids" select="$parsed_widgets/widget[not(@type = $excluded_types) and not(@id = $discardable_elements/@id)]/@id"/>
+  <xsl:variable name="page_ids" select="$parsed_widgets/widget[@type = 'Page']/@id"/>
   <xsl:variable name="hmi_widgets" select="$hmi_elements[@id = $included_ids]"/>
+  <xsl:variable name="page_widgets" select="$hmi_elements[@id = $page_ids]"/>
   <xsl:variable name="result_widgets" select="$result_svg_ns//*[@id = $hmi_widgets/@id]"/>
   <declarations:hmi-elements/>
   <xsl:template match="declarations:hmi-elements">
@@ -2402,7 +2431,7 @@
 </xsl:text>
     <xsl:text>var hmi_widgets = {
 </xsl:text>
-    <xsl:apply-templates mode="hmi_widgets" select="$hmi_widgets"/>
+    <xsl:apply-templates mode="hmi_widgets" select="$hmi_widgets | $page_widgets"/>
     <xsl:text>}
 </xsl:text>
     <xsl:text>
@@ -6367,10 +6396,10 @@
       <xsl:variable name="target_page_path">
         <xsl:choose>
           <xsl:when test="arg">
-            <xsl:value-of select="$hmi_pages_descs[arg[1]/@value = $target_page_name]/path[1]/@value"/>
+            <xsl:value-of select="$hmi_pages_descs[arg[1]/@value = $target_page_name]/path[not(@assign)]/@value"/>
           </xsl:when>
           <xsl:otherwise>
-            <xsl:value-of select="$page_desc/path[1]/@value"/>
+            <xsl:value-of select="$page_desc/path[not(@assign)]/@value"/>
           </xsl:otherwise>
         </xsl:choose>
       </xsl:variable>
@@ -7195,6 +7224,128 @@
     <xsl:text>    ],
 </xsl:text>
   </xsl:template>
+  <xsl:template match="widget[@type='Page']" mode="widget_desc">
+    <type>
+      <xsl:value-of select="@type"/>
+    </type>
+    <longdesc>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>Arguments are either:
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>- XXX reference path TODO
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>- name=value: setting variable with literal value.
+</xsl:text>
+      <xsl:text>- name=other_name: copy variable content into another
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>"active"+"inactive" labeled elements can be provided to show feedback when pressed
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>Exemples:
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+      <xsl:text>HMI:Page:notify=1@notify=/PLCVAR
+</xsl:text>
+      <xsl:text>HMI:Page:ack=2:notify=1@ack=.local_var@notify=/PLCVAR
+</xsl:text>
+      <xsl:text>
+</xsl:text>
+    </longdesc>
+    <shortdesc>
+      <xsl:text>Page </xsl:text>
+    </shortdesc>
+  </xsl:template>
+  <xsl:template match="widget[@type='Page']" mode="widget_defs">
+    <xsl:param name="hmi_element"/>
+    <xsl:variable name="disability">
+      <xsl:call-template name="defs_by_labels">
+        <xsl:with-param name="hmi_element" select="$hmi_element"/>
+        <xsl:with-param name="labels">
+          <xsl:text>/disabled</xsl:text>
+        </xsl:with-param>
+        <xsl:with-param name="mandatory" select="'no'"/>
+      </xsl:call-template>
+    </xsl:variable>
+    <xsl:value-of select="$disability"/>
+    <xsl:variable name="has_disability" select="string-length($disability)&gt;0"/>
+    <xsl:text>    assignments: {},
+</xsl:text>
+    <xsl:text>    dispatch: function(value, oldval, varnum) {
+</xsl:text>
+    <xsl:variable name="widget" select="."/>
+    <xsl:for-each select="path">
+      <xsl:variable name="varid" select="generate-id()"/>
+      <xsl:variable name="varnum" select="position()-1"/>
+      <xsl:if test="@assign">
+        <xsl:for-each select="$widget/path[@assign]">
+          <xsl:if test="$varid = generate-id()">
+            <xsl:text>        if(varnum == </xsl:text>
+            <xsl:value-of select="$varnum"/>
+            <xsl:text>) this.assignments["</xsl:text>
+            <xsl:value-of select="@assign"/>
+            <xsl:text>"] = value;
+</xsl:text>
+          </xsl:if>
+        </xsl:for-each>
+      </xsl:if>
+    </xsl:for-each>
+    <xsl:text>    },
+</xsl:text>
+    <xsl:text>    assign: function() {
+</xsl:text>
+    <xsl:variable name="paths" select="path"/>
+    <xsl:for-each select="arg[contains(@value,'=')]">
+      <xsl:variable name="name" select="substring-before(@value,'=')"/>
+      <xsl:variable name="value" select="substring-after(@value,'=')"/>
+      <xsl:variable name="index">
+        <xsl:for-each select="$paths">
+          <xsl:if test="@assign = $name">
+            <xsl:value-of select="position()-1"/>
+          </xsl:if>
+        </xsl:for-each>
+      </xsl:variable>
+      <xsl:variable name="isVarName" select="regexp:test($value,'^[a-zA-Z_][a-zA-Z0-9_]+$')"/>
+      <xsl:choose>
+        <xsl:when test="$isVarName">
+          <xsl:text>        const </xsl:text>
+          <xsl:value-of select="$value"/>
+          <xsl:text> = this.assignments["</xsl:text>
+          <xsl:value-of select="$value"/>
+          <xsl:text>"];
+</xsl:text>
+          <xsl:text>        if(</xsl:text>
+          <xsl:value-of select="$value"/>
+          <xsl:text> != undefined)
+</xsl:text>
+          <xsl:text>            this.apply_hmi_value(</xsl:text>
+          <xsl:value-of select="$index"/>
+          <xsl:text>, </xsl:text>
+          <xsl:value-of select="$value"/>
+          <xsl:text>);
+</xsl:text>
+        </xsl:when>
+        <xsl:otherwise>
+          <xsl:text>        this.apply_hmi_value(</xsl:text>
+          <xsl:value-of select="$index"/>
+          <xsl:text>, </xsl:text>
+          <xsl:value-of select="$value"/>
+          <xsl:text>);
+</xsl:text>
+        </xsl:otherwise>
+      </xsl:choose>
+    </xsl:for-each>
+    <xsl:text>    },
+</xsl:text>
+  </xsl:template>
   <xsl:template match="widget[@type='PathSlider']" mode="widget_desc">
     <type>
       <xsl:value-of select="@type"/>
@@ -12322,6 +12473,12 @@
 </xsl:text>
           <xsl:text>
 </xsl:text>
+          <xsl:text>    // when entering a page, assignments are evaluated
+</xsl:text>
+          <xsl:text>    new_desc.widgets[0][0].assign();
+</xsl:text>
+          <xsl:text>
+</xsl:text>
           <xsl:text>    return true;
 </xsl:text>
           <xsl:text>};