Why SAXParser doesn't like namespace in root element?

This is my XML:

<?xml version="1.0"?>
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
  xmlns:ui="http://java.sun.com/jsf/facelets"
  xmlns:h="http://java.sun.com/jsf/html">
  <ui:define name="title">
    <h:outputText value="some t开发者_运维知识库ext"/>
  </ui:define>
</ui:composition>

This is what SAXParser from Xerces is saying:

Cannot find the declaration of element 'ui:composition'

What am I doing wrong?

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Maybe you have XML Schema validation turned on, and the parser doesn't know where to find the XSD for the namespace?

What does the code look to parse the XML?

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did you configure the saxparser to be namespace aware? (that is usually disabled by default). (you configured this on the SAXParserFactory before creating the SAXParser).

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I predict that the real error message looks like:

SAXParseException:cvc - elt.1: Cannot find the declaration of element ...

and that would indicate that you turned on schema validation without enough schema.