Index: trunk/doc/design/03_drawing.html
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--- trunk/doc/design/03_drawing.html	(revision 1946)
+++ trunk/doc/design/03_drawing.html	(revision 1947)
@@ -155,6 +155,20 @@
 <p>{des3:22} The coordinate system is demonstrated by the following figure:
 <p><img src="03_coords.png">
 
+<h3> 3.1.4. Common attributes </h3>
+<p>{des3:80} Every drawing object may have these attributes with the same
+meanining. These common attributes are not listed in each object type's
+attribute list in the following sections.
+
+<p><table border=1 cellspacing=0>
+<tr><th colspan=3 bgcolor="#aaaaaa"> {des3:81} common attributes
+<tr><th> attribute  <th> value          <th> description
+<tr><td> lock       <th> yes/no        <th> if yes, the object is locked (should not be selected or edited individually)
+<tr><td> floater    <th> yes/no        <th> if yes, bypass the "group lock"; non-floater objects are group-locked by default (can't be selected or edited individually) if they are part of a group other than sheet's direct
+</table>
+
+
+
 <h2> 3.2. Atoms </h2>
 
 <h3> 3.2.1. Line (segment) </h3>