xml - How to fix xsd schema validation errors? -

i trying write xsd schema based on example msdn. have modified example xsd local xml file , not use namespace. however, xml fails validate.

xsd file (sys_params.xsd):

<xs:schema xmlns:xs="http://www.w3.org/2001/xmlschema" targetnamespace="http://tempuri.org/po.xsd"  xmlns="http://tempuri.org/po.xsd" elementformdefault="qualified">  <xs:annotation>   <xs:documentation xml:lang="en">    purchase order schema example.com.    copyright 2000 example.com. rights reserved.   </xs:documentation>  </xs:annotation>   <xs:element name="purchaseorder" type="purchaseordertype"/>   <xs:element name="comment" type="xs:string"/>   <xs:complextype name="purchaseordertype">   <xs:sequence>    <xs:element name="shipto" type="usaddress"/>    <xs:element name="billto" type="usaddress"/>    <xs:element ref="comment" minoccurs="0"/>    <xs:element name="items"  type="items"/>   </xs:sequence>   <xs:attribute name="orderdate" type="xs:date"/>  </xs:complextype>   <xs:complextype name="usaddress">       <xs:annotation>       <xs:documentation>        purchase order schema example.microsoft.com.        copyright 2001 example.microsoft.com. rights reserved.       </xs:documentation>       <xs:appinfo>         application info.       </xs:appinfo>      </xs:annotation>    <xs:sequence>    <xs:element name="name"   type="xs:string"/>    <xs:element name="street" type="xs:string"/>    <xs:element name="city"   type="xs:string"/>    <xs:element name="state"  type="xs:string"/>    <xs:element name="zip"    type="xs:decimal"/>   </xs:sequence>   <xs:attribute name="country" type="xs:nmtoken"      fixed="us"/>  </xs:complextype>   <xs:complextype name="items">   <xs:sequence>    <xs:element name="item" minoccurs="0" maxoccurs="unbounded">     <xs:complextype>      <xs:sequence>       <xs:element name="productname" type="xs:string"/>       <xs:element name="quantity">        <xs:simpletype>         <xs:restriction base="xs:positiveinteger">          <xs:maxexclusive value="100"/>         </xs:restriction>        </xs:simpletype>       </xs:element>       <xs:element name="usprice"    type="xs:decimal"/>       <xs:element ref="comment"   minoccurs="0"/>       <xs:element name="shipdate" type="xs:date" minoccurs="0"/>      </xs:sequence>      <xs:attribute name="partnum" type="sku" use="required"/>     </xs:complextype>    </xs:element>   </xs:sequence>  </xs:complextype>   <!-- stock keeping unit, code identifying products -->  <xs:simpletype name="sku">   <xs:restriction base="xs:string">    <xs:pattern value="\d{3}-[a-z]{2}"/>   </xs:restriction>  </xs:simpletype>  </xs:schema> 

xml file (sys_params.xml):

<?xml version="1.0" encoding="utf-8"?>  <purchaseorder xmlns="http://www.w3.org/2001/xmlschema-instance" xsi:nonamespaceschemalocation="sys_params.xsd" orderdate="1999-10-20">     <shipto country="us">         <name>alice smith</name>         <street>123 maple street</street>         <city>mill valley</city>         <state>ca</state>         <zip>90952</zip>     </shipto>     <billto country="us">         <name>robert smith</name>         <street>8 oak avenue</street>         <city>old town</city>         <state>pa</state>         <zip>95819</zip>     </billto>     <comment>hurry, lawn going wild!</comment>     <items>         <item partnum="872-aa">             <productname>lawnmower</productname>             <quantity>1</quantity>             <usprice>148.95</usprice>             <comment>confirm electric</comment>         </item>         <item partnum="926-aa">             <productname>baby monitor</productname>             <quantity>1</quantity>             <usprice>39.98</usprice>             <shipdate>1999-05-21</shipdate>         </item>     </items> </purchaseorder> 

line 3 of xml file fails validate:

<purchaseorder xmlns="http://www.w3.org/2001/xmlschema-instance" xsi:nonamespaceschemalocation="leda_sys_params.xsd" orderdate="1999-10-20"> 

the error is:

error prefix 'xsi' can not resolved namespace uri 

how can fix please?

you not allowed add <xsd:element> directly under <xsd:complextype>.

assuming want have first <shipto> tag, <item> tag, use <xsd:sequence> gathering tag constitute content of order type:

    <xsd:complextype name="order">       <xsd:sequence>         <xsd:element   name="shiptos"    type="shipaddress"/>         <xsd:element   name="items"     type="cditems"/>       </xsd:sequence>     </xsd:complextype> 

the fixed version of schema turn to:

<?xml version="1.0" encoding="utf-8"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/xmlschema" elementformdefault="qualified">     <xsd:element name="root"/>     <xsd:element name="shiporder" type="order"/>     <xsd:complextype name="order">         <xsd:sequence>             <xsd:element name="shipto" type="shipaddress"/>             <xsd:element name="items" type="cditems"/>         </xsd:sequence>     </xsd:complextype>     <xsd:complextype name="shipaddress">         <xsd:sequence>             <xsd:element name="name" type="xsd:string"/>             <xsd:element name="street" type="xsd:string"/>             <xsd:element name="address" type="xsd:string"/>             <xsd:element name="country" type="xsd:string"/>         </xsd:sequence>     </xsd:complextype>     <xsd:complextype name="cditems">         <xsd:sequence>             <xsd:element name="item" minoccurs="0" maxoccurs="unbounded" type="cditem"/>         </xsd:sequence>     </xsd:complextype>     <xsd:complextype name="cditem">         <xsd:sequence>             <xsd:element name="title" type="xsd:string"/>             <xsd:element name="quantity" type="xsd:positiveinteger"/>             <xsd:element name="price" type="xsd:decimal"/>         </xsd:sequence>     </xsd:complextype> </xsd:schema> 

note: have not bound <root> element type of content...