Getting Invalid Child Element, how to modify schema?

[EDN Admin]

Hi,
How to modify schema of an element in order to avoid validation error like "Invalid Child Element" or "List of possible elements expected"? I tried putting a value string in CarModel element and also an empty "<CarModel></CarModel>",
still getting an error... For the "List of possible elements", when I removed the "maxOccurs" attribute this validation error disappears... I want it this element to have either single or multiple instances... Can anyone tells me how to correct the
schema definition and explain why I am getting these errors? Thanks.
Sample Schema definition:
<pre class="prettyprint <?xml version="1.0" encoding="utf-8"?>
<xs:schema id="NewDataSet" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" elementFormDefault="qualified
<xs:element name="SOT
<xs:complexType>
<xs:sequence>
<xs:element name="TOT" type="xs:string" minOccurs="0" />
<xs:element name="ACC" type="xs:string" minOccurs="0" />
<xs:element name="PID" type="xs:string" minOccurs="0" />
<xs:element name="DOB" type="xs:string" minOccurs="0" />
<xs:element name="GENDER" type="xs:string" minOccurs="0" />
<xs:element name="DETAIL" type="xs:string" minOccurs="0" />
<xs:element name="PROVTYPE" type="xs:string" minOccurs="0" />
<xs:element name="MESSAGE" type="xs:string" minOccurs="0" msdata:AllowDBNull="true" />
<xs:element name="ANSWER" type="xs:string" minOccurs="0" />
<xs:element name="VERSION" type="xs:string" minOccurs="0" />
<xs:element name="NEWDRUG" minOccurs="0" maxOccurs="unbounded
<xs:complexType>
<xs:sequence>
<xs:element name="NEWDRUG_LINE" type="xs:string" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="NewDataSet" msdata:IsDataSet="true" msdata:UseCurrentLocale="true
<xs:complexType>
<xs:choice minOccurs="0" >
<xs:element ref="SOT" />
</xs:choice>
</xs:complexType>
</xs:element>
</xs:schema>[/code]
<br/>
Xml Sample Data:

<pre class="prettyprint <SOT><TOT>HISTORY-REQ</TOT><ACC>MAINMSRI</ACC><PID>G424334</PID><DOB>19890820</DOB><GENDER>2</GENDER>
<DETAIL>RX</DETAIL><PROVTYPE>20</PROVTYPE>
<NEWDRUG>
<NEWDRUG_LINE>20120306 68115091200 30000 30 AB123456</NEWDRUG_LINE>
</NEWDRUG>
<MESSAGE></MESSAGE><ANSWER></ANSWER>
<VERSION>99</VERSION></SOT>[/code]
<br/>
Thanks,
Dennis
<br/>

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