Look up the value of a property.

The property name is any fully-qualified URI. It is possible for a ValidatorHandler to recognize a property name but temporarily be unable to return its value. Some property values may be available only in specific contexts, such as before, during, or after a validation.

ValidatorHandlers are not required to recognize any specific property names.

Implementors are free (and encouraged) to invent their own properties, using names built on their own URIs.

Parameters:

name The property name, which is a non-null fully-qualified URI.

Returns: The current value of the property.

Exceptions:

SAXNotRecognizedException     If the property value can't be assigned or retrieved.

SAXNotSupportedException     When the XMLReader recognizes the property name but cannot determine its value at this time.

NullPointerException     When name is null.

`SAXNotRecognizedException`		If the property value can't be assigned or retrieved.
`SAXNotSupportedException`		When the XMLReader recognizes the property name but cannot determine its value at this time.
`NullPointerException`		When `name` is `null`.