NullPointerException in NamespaceMap.getNamespaceURI() method
-------------------------------------------------------------

                 Key: XMLSCHEMA-13
                 URL: https://issues.apache.org/jira/browse/XMLSCHEMA-13
             Project: XmlSchema
          Issue Type: Bug
    Affects Versions: XmlSchema 2.0
            Reporter: Dmitry Repchevsky


The method uses toString() without checking whether namespace exists for the 
prefix

public String getNamespaceURI(String prefix) {
    return get(prefix).toString();
}

should be:

public String getNamespaceURI(String prefix) {
    String namespaceURI = get(prefix);
    return namespaceURI == null ? null : namespaceURI .toString();
}

the latter fix would allow a correct behavior for the next code found in 
XmlSchemaSerializer:

            if (ctx != null && ctx.getNamespaceURI(xsdPrefix) != null) {
                xsdPrefix = "xsd";
            }

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