The caller cannot generally assume that the value object is a meaningful Java object. For example, the caller cannot expect this method to return java.lang.Number type for the "integer" type of XML Schema Part 2.
Also, the caller cannot assume that the equals method and the hashCode method of the value object are consistent with the semantics of the datatype. For that purpose, the sameValue method and the valueHashCode method have to be used. Note that this means you cannot use classes like java.util.Hashtable to store the value objects.
The returned value object should be used solely for the sameValue and valueHashCode methods. @param context If this datatype is context-dependent (when the {@link #isContextDependent} method returns true),then the caller must provide a non-null valid context object. Otherwise, the caller can pass null. @return nullwhen the given lexical value is not a valid lexical value for this type.
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