The noNamespaceSchemaLocation attribute references an XML Schema document that does not have a target namespace.
<xsi:noNamespaceSchemaLocation="anyURI" >
An XML Schema is not required to have a namespace. To specify the location for an XML Schema that does not have a target namespace, use the noNamespaceSchemaLocation attribute. The XML Schema referenced in this attribute cannot have a target namespace. Because this attribute does not take a list of URLs, you can only specify one schema location.
According to the World Wide Web Consortium (W3C) XML Schema Recommendation, XML instance documents can have both xsi:schemaLocation and xsi:noNamespaceSchemaLocation attributes specified.
The following example shows the use of the xsi:noNamespaceSchemaLocation attribute on an instance document that contains unqualified elements.
<person xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation
="http://adventure- works.com/schemas/person.xsd">
<name>John</name>
<height>59</height>
</person>
XML Schema Reference | XML Schema Elements | XML Schema Instance Attributes |schemaLocation