update schema for <list>

Author: pml-gh

code/odd/tei_kp1.odd

@@ -530,25 +530,24 @@
                 </elementSpec>
                 <elementSpec ident="list" mode="change">
                     <attList>
-                        <attDef ident="type" mode="change">
+                        <attDef ident="type" mode="change" usage="req">
                             <valList mode="change" type="closed">
                                 <valItem ident="basic" mode="add">
-                                    <desc versionDate="2024-03-25" xml:lang="en">a simple list of
-                                        unordered items without description.</desc>
+                                    <desc versionDate="2024-03-25" xml:lang="en">a generic list of items</desc>
                                 </valItem>
                                 <valItem ident="errata" mode="add">
                                     <desc versionDate="2024-03-25" xml:lang="en">each item contains
                                         the error and correction, with a page number. Use
                                         <gi>label</gi> for the error and page number, followed by
-                                        the correction as <gi>item</gi>. </desc>
+                                        the correction as <gi>item</gi> </desc>
                                 </valItem>
                                 <valItem ident="chronology" mode="add">
-                                    <desc versionDate="2024-06-10" xml:lang="en">Use <gi>label</gi>
+                                    <desc versionDate="2024-06-10" xml:lang="en">use <gi>label</gi>
                                         for the date, followed by the event as <gi>item</gi>.</desc>
                                 </valItem>
                             </valList>
                         </attDef>
-                        <attDef ident="rend" mode="change">
+                        <attDef ident="rend" mode="change" usage="req">
                             <valList mode="change" type="closed">
                                 <valItem ident="bulleted" mode="add">
                                     <desc versionDate="2024-03-25" xml:lang="en">items preceded by