diff --git a/docs/explore.xqbk b/docs/explore.xqbk
index a52f381..6df7eae 100644
--- a/docs/explore.xqbk
+++ b/docs/explore.xqbk
@@ -1 +1 @@
-{"cells":[{"kind":2,"language":"xquery","value":"(:<:)\r\n\r\nimport module namespace docs=\"lsp/docs\" at \"/srv/basex/webapp/lsp/docs.xqm\";"},{"kind":2,"language":"xquery","value":"ws:ids()"},{"kind":2,"language":"xquery","value":"let $f:=docs:list(ws:ids())[1]\r\nreturn docs:get(ws:ids(),$f,\"parse\")"}]}
\ No newline at end of file
+{"cells":[{"kind":2,"language":"xquery","value":"(:<:)\r\n\r\nimport module namespace docs=\"lsp/docs\" at \"/srv/basex/webapp/lsp/docs.xqm\";"},{"kind":2,"language":"xquery","value":"ws:ids()"},{"kind":2,"language":"xquery","value":"let $sock:=foot(ws:ids())\r\nlet $f:=docs:list($sock)\r\nreturn docs:get($sock,$f,\"textDocument\")"}]}
\ No newline at end of file
diff --git a/webapp/lsp/docs.xqm b/webapp/lsp/docs.xqm
index ff334cc..4d1aafe 100644
--- a/webapp/lsp/docs.xqm
+++ b/webapp/lsp/docs.xqm
@@ -1,35 +1,19 @@
 (: Store for XQuery document data , type, text,uri
  on save parse is created and stored
- implementation: data is stored in webSocket
+ data is stored in webSocket attributes
 @author Andy Bunce
 :)
 module namespace docs="lsp/docs";
 import module namespace p="xq4" at "xq4.xqm";
 import module namespace pos="lsp/position" at "position.xqm";
 
-
-(: document info :)
-declare type docs:property as enum(
-    "textDocument",
-    "parse"
-);
-
-(: get $property for $file from session $socket :)
-declare function docs:get(
-    $socket as xs:string,
-    $file as xs:string,
-    $property as docs:property
-)
-{
-    let $key:=ws:get($socket,"files")($file)($property)
-    return ws:get($socket,$key)
-};
-
-(: save $textDocument data as session $socket properties :)
-declare function docs:save(
+(: save $textDocument data as session $socket properties 
+@return uri
+:)
+declare function docs:open(
     $socket as xs:string,
     $params as map(*)
-)
+) as xs:string
 {
 let $text as xs:string:=$params?textDocument?text
 let $uri:=$params?textDocument?uri
@@ -42,13 +26,35 @@ let $files:=if(map:contains($files,$uri))
                 "textDocument": "file-" || $uuid,
                 "parse": "parse-" || $uuid })
 let $keys:=$files($uri)
-let $xml:=prof:time(p:parse-Module($text),"⏱️ p:parse-Module ")
-
 return (
     ws:set($socket,"files",$files),
     ws:set($socket,$keys?textDocument,$params?textDocument),
-    ws:set($socket,$keys?parse,$xml)
-) 
+    $uri
+    )
+};
+
+(: change $textDocument data as session $socket properties 
+@return uri
+:)
+declare function docs:change(
+    $socket as xs:string,
+    $params as map(*)
+) as xs:string
+{
+let $uri:=$params?textDocument?uri
+let $key:=docs:key($socket,$uri,"textDocument")
+let $file:=if(exists($key))
+           then ws:get($socket,$key)
+           else error("no file")
+let $ver:=$params?textDocument?version
+let $text:=if($ver eq 1+ $file?version)
+          then pos:apply-changes($file?text,$params?contentChanges)
+          else error("bad ver")
+let $file:=$file=>map:put("version",$ver)=>map:put("text",$text)
+
+return (ws:set($socket,$key,$file),
+    `{$uri} V{ $ver}  text: { $text}`
+    )
 };
 
 (:~ close a file :)
@@ -63,9 +69,27 @@ return if(map:contains($files,$uri))
              )
        else ()
 };
-(:~ list a file :)
+
+(:~ list of all files :)
 declare function docs:list($socket as xs:string)
 as xs:string*{
 ws:get($socket,"files",{})=>map:keys()
 
+};
+
+(: document info :)
+declare type docs:property as enum(
+    "textDocument",
+    "parse"
+);
+
+(: get $property key for $file from session $socket :)
+declare function docs:key(
+    $socket as xs:string,
+    $file as xs:string,
+    $property as docs:property
+) as xs:string?
+{
+    ws:get($socket,"files")($file)($property)
+
 };
\ No newline at end of file
diff --git a/webapp/lsp/lsp-text.xqm b/webapp/lsp/lsp-text.xqm
index c116246..1cb29fe 100644
--- a/webapp/lsp/lsp-text.xqm
+++ b/webapp/lsp/lsp-text.xqm
@@ -2,7 +2,7 @@
  : @author andy bunce
  :)
 module namespace lsp-text = 'lsp-text';
-
+import module namespace docs="lsp/docs" at "docs.xqm";
 
 declare variable $lsp-text:methods:=map{
   "textDocument/didOpen": lsp-text:didOpen#1,
@@ -55,13 +55,23 @@ declare
 function lsp-text:didOpen($json as map(*)) 
 as empty-sequence()
 {
+  let $uri:=docs:open(ws:id(),$json?params)=>prof:time("⏱️ doc:save ")
+ 
+ (:
+  let $xml:=prof:time(p:parse-Module($text),"⏱️ p:parse-Module ")
  let $x:=job:eval(xs:anyURI("parse.xq"),
              {"params" : $json?params,
              "webSocket":ws:id()},
              { 'cache': true() }
              )
- 
- return ()
+ :)
+ return  ws:send(
+    {"jsonrpc": "2.0",
+     "method":"window/logMessage",
+     "params":{"type":1,"message":"saved " || $uri}
+    },
+    ws:id()
+)
 };
 
 (:~  didChange method response :)
@@ -69,13 +79,15 @@ declare
 function lsp-text:didChange($json as map(*)) 
 as map(*)?
 {
-
- let $x:=job:eval(xs:anyURI("parse.xq"),
-             {"params": $json?params,"webSocket":ws:id()},
-             { 'cache': true() }
-             )
+ let $msg:=docs:change(ws:id(),$json?params)=>prof:time("⏱️ doc:change ")
  
- return ()
+ return ws:send(
+    {"jsonrpc": "2.0",
+     "method":"window/logMessage",
+     "params":{"type":1,"message":"changed " || $msg}
+    },
+    ws:id()
+)
 };
 
 
diff --git a/webapp/lsp/parse.xq b/webapp/lsp/parse.xq
index 9dc8ce4..3fa7eb1 100644
--- a/webapp/lsp/parse.xq
+++ b/webapp/lsp/parse.xq
@@ -5,7 +5,7 @@ import module namespace docs="lsp/docs" at "docs.xqm";
 declare variable $params  as map(*) external;
 declare variable $webSocket as xs:string external;
 
-docs:save(
+docs:open(
     $webSocket,
     $params 
 )=>prof:time("⏱️ doc:save "),