Re: xsd question

how would one use annotation or documentation in XML schema?

I tried
 <xsd:annotation>
            <xsd:appInfo>="this is collection of regexType
complex"</xsd:appInfo>
 </xsd:annotation>

 <xsd:annotation>
            this is collection of regexType complex
 </xsd:annotation>

<!-- copied form some example on the web -->
<xsd:annotation>
            <xsd:appInfo>W3Schools Note</xsd:appInfo>
            <xsd:documentation xml:lang="en">
                This Schema defines a W3Schools note!
            </xsd:documentation>
</xsd:annotation>

all got rejected by Netbean 5.5 IDE MXL validator

the XSD I am working starts with
<!-- <?xml version="1.0" encoding="UTF-8"?> -->

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            xmlns:ns="http://xml.netbeans.org/examples/targetNS"
            targetNamespace="http://xml.netbeans.org/examples/targetNS"
            xmlns="http://xml.netbeans.org/examples/targetNS"
            elementFormDefault="qualified">