XML Schema Validation Cannot find the declaration of element

Question

I am still a bit new to XML Schema etc  and have been working to develop some XML  Schema and a Stylesheet  XSLT   I have made reasonable progress  but then realized that my Schema had stopped working  so I have taken it back to a simpler non-descript example   Here is my XML    lt  xml version  1 0  encoding  UTF-8   gt   lt Root xmlns xsi  http   www w3 org 2001 XMLSchema-instance        xmlns  Test Namespace          schemaLocation  http   myNameSpace com Test1 xsd  gt       lt element1 id  001  gt           lt element2 id  001 1  gt                lt element3 id  001 1    gt           lt  element2 gt       lt  element1 gt   lt  Root gt    I have written a Schema that is here    lt  xml version  1 0   gt   lt xsd schema xmlns xsd  http   www w3 org 2001 XMLSchema              targetNamespace  Test Namespace              elementFormDefault  qualified  gt       lt xsd element name  Root  gt           lt xsd complexType gt               lt xsd sequence gt                   lt xsd element name  element1  maxOccurs  unbounded  type  element1Type   gt               lt  xsd sequence gt           lt  xsd complexType gt       lt  xsd element gt        lt xsd complexType name  element1Type  gt           lt xsd sequence gt               lt xsd element name  element2  maxOccurs  unbounded  type  element2Type   gt           lt  xsd sequence gt           lt xsd attribute name  id  type  xsd string   gt       lt  xsd complexType gt        lt xsd complexType name  element2Type  gt           lt xsd sequence gt               lt xsd element name  item  type  element3Type   gt           lt  xsd sequence gt           lt xsd attribute name  id  type  xsd string   gt       lt  xsd complexType gt        lt xsd complexType name  element3Type  gt            lt xsd attribute name  id  type  xsd string   gt       lt  xsd complexType gt            lt  xsd schema gt    The Schema is representative of the structure of my real XML   Now  when I try to validate my XML  I get this error   cvc-elt 1  Cannot find the declaration of element  Root    7    This I think is to do with a namespace issue on the Root element  but I am really not sure   Can someone suggest what I am doing wrong please

User · Answer

The targetNamespace of your XML Schema does not match the namespace of the Root element  dot in Test Namespace vs  comma in Test Namespace   Once you make the above agree  you have to consider that your element2 has an attribute order that is not in your XSD

User · Answer

Thanks to everyone above  but this is now fixed  For the benefit of others the most significant error was in aligning the three namespaces as suggested by Ian  For completeness  here is the corrected XML and XSD Here is the XML  with the typos corrected  sorry for any confusion caused by tardiness   lt  xml version  quot 1 0 quot  encoding  quot UTF-8 quot   gt    lt Root xmlns xsi  quot http   www w3 org 2001 XMLSchema-instance quot        xmlns  quot urn Test Namespace quot          xsi schemaLocation  quot urn Test Namespace Test1 xsd quot  gt       lt element1 id  quot 001 quot  gt           lt element2 id  quot 001 1 quot  gt               lt element3 id  quot 001 1 quot    gt           lt  element2 gt       lt  element1 gt   lt  Root gt   and  here is the Schema  lt  xml version  quot 1 0 quot   gt    lt xsd schema xmlns xsd  quot http   www w3 org 2001 XMLSchema quot              targetNamespace  quot urn Test Namespace quot              xmlns  quot urn Test Namespace quot              elementFormDefault  quot qualified quot  gt       lt xsd element name  quot Root quot  gt           lt xsd complexType gt               lt xsd sequence gt                   lt xsd element name  quot element1 quot  maxOccurs  quot unbounded quot  type  quot element1Type quot   gt               lt  xsd sequence gt           lt  xsd complexType gt       lt  xsd element gt               lt xsd complexType name  quot element1Type quot  gt           lt xsd sequence gt               lt xsd element name  quot element2 quot  maxOccurs  quot unbounded quot  type  quot element2Type quot   gt           lt  xsd sequence gt           lt xsd attribute name  quot id quot  type  quot xsd string quot   gt       lt  xsd complexType gt               lt xsd complexType name  quot element2Type quot  gt           lt xsd sequence gt               lt xsd element name  quot element3 quot  type  quot element3Type quot   gt           lt  xsd sequence gt           lt xsd attribute name  quot id quot  type  quot xsd string quot   gt       lt  xsd complexType gt        lt xsd complexType name  quot element3Type quot  gt           lt xsd attribute name  quot id quot  type  quot xsd string quot   gt       lt  xsd complexType gt           lt  xsd schema gt   Thanks again to everyone  I hope this is of use to somebody else in the future

User · Answer

cvc-elt 1  Cannot find the declaration of element  Root    7    Your schemaLocation attribute on the root element should be xsi schemaLocation  and you need to fix it to use the right namespace   You should probably change the targetNamespace of the schema and the xmlns of the document to http   myNameSpace com  since namespaces are supposed to be valid URIs  which Test Namespace isn t  though urn Test Namespace would be ok   Once you do that it should find the schema  The point is that all three of the schema s target namespace  the document s namespace  and the namespace for which you re giving the schema location must be the same    though it still won t validate as your  lt element2 gt  contains an  lt element3 gt  in the document where the schema expects item

[xml] XML Schema Validation : Cannot find the declaration of element

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