--- a/svghmi/Makefile	Mon Mar 16 17:09:23 2020 +0100
+++ b/svghmi/Makefile	Mon Mar 16 18:27:49 2020 +0100
@@ -11,7 +11,7 @@
 
 yml2path ?= $(abspath ../../yml2)
 
-ysl2files := $(wildcard *.ysl2)
+ysl2files := gen_index_xhtml.ysl2
 xsltfiles := $(patsubst %.ysl2, %.xslt, $(ysl2files))
 
 all:$(xsltfiles)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/svghmi/bbox_intersect.ysl2	Mon Mar 16 18:27:49 2020 +0100
@@ -0,0 +1,120 @@
+// bbox_intersect.ysl2
+//
+// bounding boxes intersection tests
+
+// Rates 1D intersection of 2 segments A and B
+// described respectively with a0,a1 and b0,b1
+def "func:intersect_1d" {
+    // it is assumed that a1 > a0 and b1 > b0
+    param "a0";
+    param "a1";
+    param "b0";
+    param "b1";
+
+    const "d0", "$a0 >= $b0";
+    const "d1", "$a1 >= $b1";
+    choose {
+        when "not($d0) and $d1"
+            // b contained in a
+            //   a0<b0 b1<a1
+            // a +--------+
+            // b    +--+
+            result "3";
+        when "$d0 and not($d1)"
+            // a contained in b
+            //   b0<a0 a1<b1
+            // a    +--+
+            // b +--------+
+            result "2";
+        when "$d0 and $d1 and $a0 < $b1"
+            // a and b are overlapped 
+            //   b0<a0<b1<a1
+            // a    +-----+
+            // b +-----+
+            result "1";
+        when "not($d0) and not($d1) and $b0 < $a1"
+            // a and b are overlapped
+            //   a0<b0<a1<b1
+            // a +-----+
+            // b    +-----+
+            result "1";
+            // since orientation doesn't matter,
+            // rated same as previous symetrical overlapping
+        otherwise
+            result "0"; /* no intersection*/
+    }
+}
+
+
+// Rates intersection A and B areas described with x,y,w and h 
+// attributes passed as $a and $b parameters.
+// 
+// returns :
+// 0 - no intersection
+//            .-----.
+//    .-----. |    b|
+//    |     | |     |
+//    |     | '-----'
+//    |a    |
+//    '-----'
+//
+// 1 - overlapping
+//        .-----.
+//    .---|--. b|
+//    |   |  |  |
+//    |   '-----'
+//    |a     |
+//    '------'
+//
+// 2 - overlapping
+//        .-----.
+//        |  a  |
+//    .---|-----|---.
+//    |   '-----'   |
+//    | b           |
+//    '-------------'
+//
+// 3 - overlapping
+//        .-----.
+//        |  b  |
+//    .---|-----|---.
+//    |   '-----'   |
+//    | a           |
+//    '-------------'
+//
+// 4 - a contained in b
+//    .-------------.
+//    |   .-----.   |
+//    |   |  a  |   |
+//    |b  '-----'   |
+//    '-------------'
+//
+// 6 - overlapping
+//        .----.
+//        |   b|
+//    .---|----|---.
+//    |a  |    |   |
+//    '---|----|---'
+//        '----'
+//
+// 9 - b contained in a
+//    .-------------.
+//    |   .-----.   |
+//    |   |  b  |   |
+//    |a  '-----'   |
+//    '-------------'
+//
+def "func:intersect" {
+    param "a";
+    param "b";
+
+    const "x_intersect", "func:intersect_1d($a/@x, $a/@x+$a/@w, $b/@x, $b/@x+$b/@w)";
+
+    choose{
+        when "$x_intersect != 0"{
+            const "y_intersect", "func:intersect_1d($a/@y, $a/@y+$a/@h, $b/@y, $b/@y+$b/@h)";
+            result "$x_intersect * $y_intersect";
+        }
+        otherwise result "0";
+    }
+}

--- a/svghmi/gen_index_xhtml.xslt	Mon Mar 16 17:09:23 2020 +0100
+++ b/svghmi/gen_index_xhtml.xslt	Mon Mar 16 18:27:49 2020 +0100
@@ -690,15 +690,11 @@
 </xsl:text>
     <xsl:text>        }
 </xsl:text>
-    <xsl:text>        /* TODO deal with multiple paths
-</xsl:text>
-    <xsl:text>           and dispatch according to index+page_offset */
-</xsl:text>
-    <xsl:text>        /*else if(typeof(d) == "object" &amp;&amp; d.length &gt;= idxidx){
+    <xsl:text>        else if(typeof(d) == "object" &amp;&amp; d.length &gt;= idxidx){
 </xsl:text>
     <xsl:text>            d[idxidx].call(widget, value, oldval);
 </xsl:text>
-    <xsl:text>        }*/
+    <xsl:text>        }
 </xsl:text>
     <xsl:text>        /* else dispatch_0, ..., dispatch_n ? */
 </xsl:text>

--- a/svghmi/gen_index_xhtml.ysl2	Mon Mar 16 17:09:23 2020 +0100
+++ b/svghmi/gen_index_xhtml.ysl2	Mon Mar 16 18:27:49 2020 +0100
@@ -85,114 +85,7 @@
         }
     }
 
-    def "func:intersect_1d" {
-        // it is assumed that a1 > a0 and b1 > b0
-        param "a0";
-        param "a1";
-        param "b0";
-        param "b1";
-
-        const "d0", "$a0 >= $b0";
-        const "d1", "$a1 >= $b1";
-        choose {
-            when "not($d0) and $d1"
-                // b contained in a
-                //   a0<b0 b1<a1
-                // a +--------+
-                // b    +--+
-                result "3";
-            when "$d0 and not($d1)"
-                // a contained in b
-                //   b0<a0 a1<b1
-                // a    +--+
-                // b +--------+
-                result "2";
-            when "$d0 and $d1 and $a0 < $b1"
-                // a and b are overlapped 
-                //   b0<a0<b1<a1
-                // a    +-----+
-                // b +-----+
-                result "1";
-            when "not($d0) and not($d1) and $b0 < $a1"
-                // a and b are overlapped
-                //   a0<b0<a1<b1
-                // a +-----+
-                // b    +-----+
-                result "1";
-            otherwise
-                result "0"; /* no intersection*/
-        }
-    }
-
-    // returns :
-    // 0 - no intersection
-    //            .-----.
-    //    .-----. |    b|
-    //    |     | |     |
-    //    |     | '-----'
-    //    |a    |
-    //    '-----'
-    //
-    // 1 - overlapping
-    //        .-----.
-    //    .---|--. b|
-    //    |   |  |  |
-    //    |   '-----'
-    //    |a     |
-    //    '------'
-    //
-    // 2 - overlapping
-    //        .-----.
-    //        |  a  |
-    //    .---|-----|---.
-    //    |   '-----'   |
-    //    | b           |
-    //    '-------------'
-    //
-    // 3 - overlapping
-    //        .-----.
-    //        |  b  |
-    //    .---|-----|---.
-    //    |   '-----'   |
-    //    | a           |
-    //    '-------------'
-    //
-    // 4 - a contained in b
-    //    .-------------.
-    //    |   .-----.   |
-    //    |   |  a  |   |
-    //    |b  '-----'   |
-    //    '-------------'
-    //
-    // 6 - overlapping
-    //        .----.
-    //        |   b|
-    //    .---|----|---.
-    //    |a  |    |   |
-    //    '---|----|---'
-    //        '----'
-    //
-    // 9 - b contained in a
-    //    .-------------.
-    //    |   .-----.   |
-    //    |   |  b  |   |
-    //    |a  '-----'   |
-    //    '-------------'
-    //
-    def "func:intersect" {
-        param "a";
-        param "b";
-
-        const "x_intersect", "func:intersect_1d($a/@x, $a/@x+$a/@w, $b/@x, $b/@x+$b/@w)";
-
-        choose{
-            when "$x_intersect != 0"{
-                const "y_intersect", "func:intersect_1d($a/@y, $a/@y+$a/@h, $b/@y, $b/@y+$b/@h)";
-                result "$x_intersect * $y_intersect";
-            }
-            otherwise result "0";
-        }
-    }
+    include bbox_intersect.ysl2
 
     // return overlapping geometry for a given element
     // all intersercting element are returned