Returns the base URI of the context.

  Returns the base URI of the context. The null string may be returned
if no base URI is known.

  Checks if a notation is declared with the specified name.

  Checks if a notation is declared with the
specified name.
Returns: true if the DTD has a notation declaration for the specified name. false otherwise.

  Checks if an unparsed entity is declared with the specified name.

  Checks if an unparsed entity is declared with the
specified name.
Returns: true if the DTD has an unparsed entity declaration for the specified name. false otherwise.

  Resolves a namespace prefix to the corresponding namespace URI.

  Resolves a namespace prefix to the corresponding namespace URI. This method is used for validating the QName type, for example.

If the prefix is "" (empty string), it indicates an unprefixed value. The callee should resolve it as for an unprefixed element, rather than for an unprefixed attribute.

If the prefix is "xml", then the callee must resolve this prefix into "http://www.w3.org/XML/1998/namespace", as defined in the XML Namespaces Recommendation.
Returns: namespace URI of this prefix. If the specified prefix is not declared, the implementation must return null.