XML Namespace has not been declared. What is a Namespace and how can this error be fixed? - Knowledge Base - Qvera
![Specifying Namespaces for Elements and Attributes | Projecting Objects to XML | InterSystems IRIS Data Platform 2023.3 Specifying Namespaces for Elements and Attributes | Projecting Objects to XML | InterSystems IRIS Data Platform 2023.3](https://docs.intersystems.com/irislatest/csp/docbook/images/gxmlproj_refnamespace_notset.png)
Specifying Namespaces for Elements and Attributes | Projecting Objects to XML | InterSystems IRIS Data Platform 2023.3
![How to query a SOAP XML message containing more than one namespace using XML Query (XQuery) | ChinChin's space How to query a SOAP XML message containing more than one namespace using XML Query (XQuery) | ChinChin's space](https://ch1n2.files.wordpress.com/2015/01/soap_xml_message_example.png)
How to query a SOAP XML message containing more than one namespace using XML Query (XQuery) | ChinChin's space
![arcobjects - Issue on ArcGIS SOAP NAServer Namespace - Geographic Information Systems Stack Exchange arcobjects - Issue on ArcGIS SOAP NAServer Namespace - Geographic Information Systems Stack Exchange](https://i.stack.imgur.com/99M33.png)
arcobjects - Issue on ArcGIS SOAP NAServer Namespace - Geographic Information Systems Stack Exchange
![visual studio - Add prefix and namespace in xml not set on correct position XML serialization - Stack Overflow visual studio - Add prefix and namespace in xml not set on correct position XML serialization - Stack Overflow](https://i.stack.imgur.com/lHV9g.png)
visual studio - Add prefix and namespace in xml not set on correct position XML serialization - Stack Overflow
![java - Customizing prefix and namespace location in soap request generated using wsdl file - Stack Overflow java - Customizing prefix and namespace location in soap request generated using wsdl file - Stack Overflow](https://i.stack.imgur.com/B0uXS.png)