Differentiate between validating and non validating parser
Regardless of what we choose, the entire instance would be validated. , we are specifying that all the elements and attributes in the instance must have a namespace, which in turn adds namespace complexity to instance.
If say that the schema is modified by making some local declarations global and/or making some global declarations local, then the instance documents are not affected at all.
Thus, having a sound grasp of the namespace concept is essential for understanding XML Schema and instance validation overall.
Thus, we see that the namespaces in XML concept is not very different from packages in Java.
Note that the prefixes are used only as a placeholder and must be expanded by the namespace-aware XML parser to use the actual namespace bound to the prefix.
A is declared as follows: Unbinding an already-bound prefix is not allowed per the W3C Namespaces in XML 1.0 Recommendation, but is allowed per W3C Namespaces in XML 1.1 Recommendation.
Here the elements Figure 1: Elements and attributes in XML Schema namespace are used to write an XML Schema document, which generates elements and attributes as defined by user and puts them in . .) During validation, the Validator verifies that the elements/attributes used in the instance exist in the declared namespace, and also checks for any other constraint on their structure and datatype.
In XML Schema we can choose to specify whether the instance document must qualify all the elements and attributes, or must qualify only the globally declared elements and attributes.
The XML Schema Validator would report validation errors if we try to validate this instance against the modified XML Schema.
Therefore, the namespaces must be fixed in the instance per the modification done in XML Schema to make the instance valid again.
In the Internet space URLs are uniquehence you would usually choose to use URLs to uniquely identify namespaces.