5.30 http://schemas.microsoft.com/office/spreadsheetml/2020/threadedcomments2 Schema

 <xsd:schema xmlns="http://schemas.microsoft.com/office/spreadsheetml/2020/threadedcomments2" targetNamespace="http://schemas.microsoft.com/office/spreadsheetml/2020/threadedcomments2" elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:x="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xm="http://schemas.microsoft.com/office/excel/2006/main">
   <xsd:import namespace="http://schemas.microsoft.com/office/excel/2006/main" schemaLocation="xlmbasictypes.xsd"/>
   <xsd:complexType name="CT_ThreadedComments2Ext">
     <xsd:sequence>
       <xsd:element name="checksum" type="xsd:unsignedInt" minOccurs="1" maxOccurs="1"/>
       <xsd:sequence>
         <xsd:element name="hyperlink" type="CT_CommentHyperlink" minOccurs="0" maxOccurs="unbounded"/>
       </xsd:sequence>
     </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="CT_CommentHyperlink">
     <xsd:sequence>
       <xsd:element name="extLst" type="x:CT_ExtensionList" minOccurs="0" maxOccurs="1"/>
     </xsd:sequence>
     <xsd:attribute name="startIndex" type="xsd:unsignedInt" use="required"/>
     <xsd:attribute name="length" type="xsd:unsignedInt" use="required"/>
     <xsd:attribute name="url" type="x:ST_Xstring" use="required"/>
   </xsd:complexType>
 </xsd:schema>