new file

diff --git a/scm/to-xml.scm b/scm/to-xml.scm
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+++ b/scm/to-xml.scm
@@ -0,0 +1,106 @@
+
+
+"
+
+
+Todo: this is a quick hack; it makes more sense to define a GOOPS
+class of a documentnode (similar to how
+; the documentation is generated.)
+
+That is much cleaner: building the document, and dumping it to output
+is then separated.
+
+"
+
+(define (dump-duration d port)
+ (display (open-tag "duration"
+           `((log . ,(duration-log d))
+             (dots . ,(duration-dot-count d))
+             (numer . ,(car (duration-factor d)))
+             (denom . ,(cdr (duration-factor d)))
+             )
+           '() ) port)
+ (display  (close-tag 'duration) port))
+
+(define (dump-pitch p port)
+ (display (open-tag "pitch"
+           `((octave . ,(pitch-octave p))
+             (notename . ,(pitch-notename p))
+             (alteration . ,(pitch-alteration p))
+             )
+           '() ) port)
+ (display  (close-tag 'pitch) port))
+
+;; should use macro
+(define (assert x)
+  (if x
+      #t
+      (error "assertion failed")))
+
+(define (open-tag tag attrs exceptions)
+  (define (candidate? x)
+    (not (memq (car x) exceptions)))
+  
+  (define (dump-attr sym-val)
+    (let*
+       (
+       (sym (car sym-val))
+       (val (cdr sym-val))
+       )
+      
+    (string-append
+     "\n   "
+    (symbol->string sym)
+    "=\""
+    
+    (call-with-output-string (lambda (port) (display val port)))
+    "\""
+    )))
+
+  (string-append
+   "<" tag
+   (apply string-append
+         (map dump-attr (filter-list candidate? attrs)))
+
+   ">\n")
+   
+  )
+(define (close-tag name)
+  (string-append "</" (symbol->string name) ">\n")
+  )
+
+(define-public (music-to-xml music port)
+  "Dump XML-ish stuff to PORT."
+   (let*
+       (
+       (name (ly-get-mus-property music 'name))
+       (e (ly-get-mus-property music 'element))
+       (es (ly-get-mus-property music 'elements))
+       (mprops (ly-get-mutable-properties music))
+       (p (ly-get-mus-property music 'pitch))
+       (d (ly-get-mus-property music 'duration))
+       (ignore-props '(origin elements duration pitch element))
+       )
+
+     (display (open-tag (symbol->string name) mprops ignore-props) port)
+     (if (duration? d)
+        (dump-duration d port))
+     (if (pitch? p)
+        (dump-pitch p port))
+     (if (pair? es)
+        (begin
+          (display "<elements>" port)
+          (map (lambda (x) (music-to-xml x port)) es)
+          (display "</elements>" port)
+          ))
+
+     (if (music? e)
+        (begin
+          (display "<element>" port)
+          (music-to-xml e port)
+          (display "</element>" port)
+          ))
+     (display (close-tag name) port)
+   ))
+   
+