How to reference local XSD from XML file?

Question

I want to write a simple XML file with a custom xsd file located in the same local directory on my computer. I don't understand the necessary syntax at the beginning of the files (I have googled but XSD tutorials seem to focus on the element definitions rather than the xsd:schema).

My sys_params.xsd begins:

<xsd:schema xmlns:xsd="http://www.w3.org/1999/XMLSchema">

<xsd:element     name="shipOrder" type="order"/>

My sys_params.xml begins:

<shiporder orderid="889923"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.w3schools.com sys_params.xsd"

<orderperson>John Smith</orderperson>

My XML reports this validation error on the xml:

Error schema document 'sys_params.xsd' has different target namespace from the one specified in instance document 'http://www.w3schools.com'

No doubt my code is quite wrong but I need some help to correct it please.

kjhughes · Accepted Answer · 2020-10-23T13:55:55.943

Change

xsi:schemaLocation="http://www.w3schools.com sys_params.xsd"

to

xsi:noNamespaceSchemaLocation="sys_params.xsd"

because your XML is not in a namespace.

See also:

How to link XML to XSD using schemaLocation or noNamespaceSchemaLocation? to understand how to reference an XSD from an XML file, depending on whether namespaces are being used or not.
How to reference a local XML Schema file correctly? if you have trouble stating the specification of the local XSD file. [Note, however, that despite the title similarities, the other link I provide is actually what will help you most with your question.]

How to reference local XSD from XML file?

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