How to resolve this 'XML Validation: Declaration not found for element' error?

Question

I'm new to SQL Server and I have this task to complete (for learning purposes), yet I'm unable to figure out this error due to inexperience with XML Schemas (I think)

Here's what I'm trying to do -

1. Create a table with 2 columns - ID, XML info for some product (non-typed).
2. Add a row entry, that is, XML data for a product.
3. Create an XML Schema for the XML-product-data.
4. Bind this schema to the one (column) in the table.

I did this similar to what is mentioned here.

-- Create table ProductDocs
CREATE TABLE ProductDocs
(
 ID INT IDENTITY PRIMARY KEY,
 ProductDoc XML NOT NULL
);
-- Insert data into ProductDocs
INSERT INTO ProductDocs
(ProductDoc)
VALUES ('<Product>
 <ProductID>1</ProductID>
 <ProductName>Chai</ProductName>
 <SupplierID>1</SupplierID>
 <CategoryID>1</CategoryID>
 <QuantityPerUnit>10 boxes x 20 bags</QuantityPerUnit>\
 <UnitPrice>18.0000</UnitPrice>
 <UnitsInStock>39</UnitsInStock>
 <UnitsOnOrder>0</UnitsOnOrder>
 <ReorderLevel>10</ReorderLevel>
 <Discontinued>0</Discontinued>
 </Product>');
-- Create XML Schema
CREATE XML SCHEMA COLLECTION XS_ProductDoc 
AS '<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
 targetNamespace="http://www.microsoft.com/schemas/adventure-works/products"
 xmlns:prod="http://www.microsoft.com/schemas/adventure-works/products">
 <xs:element name="Product">
 <xs:complexType>
 <xs:sequence>
 <xs:element ref="prod:ProductID" />
 <xs:element ref="prod:ProductName" />
 <xs:element ref="prod:SupplierID" />
 <xs:element ref="prod:CategoryID" />
 <xs:element ref="prod:QuantityPerUnit" />
 <xs:element ref="prod:UnitPrice" />
 <xs:element ref="prod:UnitsInStock" />
 <xs:element ref="prod:UnitsOnOrder" />
 <xs:element ref="prod:ReorderLevel" />
 <xs:element ref="prod:Discontinued" /> 
 </xs:sequence>
 </xs:complexType>
 </xs:element>
 <xs:element name="ProductID" type="xs:integer" />
 <xs:element name="ProductName" type="xs:string" />
 <xs:element name="SupplierID" type="xs:integer" />
 <xs:element name="CategoryID" type="xs:integer" />
 <xs:element name="QuantityPerUnit" type="xs:string" />
 <xs:element name="UnitPrice" type="xs:double" />
 <xs:element name="UnitsInStock" type="xs:integer" />
 <xs:element name="UnitsOnOrder" type="xs:integer" />
 <xs:element name="ReorderLevel" type="xs:integer" />
 <xs:element name="Discontinued" type="xs:boolean" />
 </xs:schema>';
-- Bind the schema
ALTER TABLE ProductDocs
ALTER COLUMN ProductDoc xml (XS_ProductDoc);

But I'm getting this error -

XML Validation: Declaration not found for element 'Product'. Location: /*:Product[1] The statement has been terminated.

Why is this error occurring? And, how can I resolve it?

Answer 1

An XML Schema Collection for that particular piece of XML would look more like this:

CREATE XML SCHEMA COLLECTION XS_ProductDoc 
AS
'<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
 <xs:element name="Product">
 <xs:complexType mixed="true">
 <xs:sequence>
 <xs:element name="ProductID" type="xs:unsignedByte" />
 <xs:element name="ProductName" type="xs:string" />
 <xs:element name="SupplierID" type="xs:unsignedByte" />
 <xs:element name="CategoryID" type="xs:unsignedByte" />
 <xs:element name="QuantityPerUnit" type="xs:string" />
 <xs:element name="UnitPrice" type="xs:decimal" />
 <xs:element name="UnitsInStock" type="xs:unsignedByte" />
 <xs:element name="UnitsOnOrder" type="xs:unsignedByte" />
 <xs:element name="ReorderLevel" type="xs:unsignedByte" />
 <xs:element name="Discontinued" type="xs:unsignedByte" />
 </xs:sequence>
 </xs:complexType>
 </xs:element>
</xs:schema>'

The reason your code does not work is because your XML does not contain any namespaces, whereas the original AdventureWorks XML does. Learn more about XML Namespaces here.

• PalashV: I understand that you've removed all the references, and this is more straightforward but I still don't get why is the Product not getting located? Isn't this Product == prod:Product? And prod namespace is also declared? I'm still confused, can you elaborate more, please?