By registering a new function, any XPath expression that utilizes this FunctionContext may refer-to and use the new function.
Functions may exist either in an namespace or not. Namespace prefix-to-URI resolution is the responsibility of a {@link NamespaceContext}. Within this FunctionContext functions are only referenced using the URI, not the prefix.
The namespace URI of a function may be null to indicate that it exists without a namespace.
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