XML in a Nutshell, 3rd Edition

Name

isDerivedFrom: typeNamespaceArg, typeNameArg, derivationMethod(3)

Synopsis

This method provides the capability to determine the relationship between the target data type and another data type (given by the typeNameArg and typeNamespaceArg arguments). This method returns true if the target type is derived from the given data type via one of the methods passed in using the derivationMethod bitmask argument; otherwise, it returns false. Currently, this method is only defined for use with XML Schema validation. For more information on type derivation methods in XML Schema, see Chapter 17.

Arguments

typeNamespaceArg: DOMString

The namespace associated with the typeNameArg argument.

typeNameArg: DOMString

The type name to be compared with the target type.

derivationMethod: unsigned long

A bitmask that restricts which types of derivation the method will recognize. The valid bitmask values are listed below:

Constant name	Value	Meaning
DERIVATION_RESTRICTION	0x00000001	The target type is derived from the other type by restricting its possible values (e.g., a positive integer is derived from a signed integer by restricting it to nonnegative values).
DERIVATION_EXTENSION	0x00000002	The target type is derived from the other type by extending its possible values (e.g., a signed integer type would be an extension of an unsigned integer).
DERIVATION_UNION	0x00000004	The target type is partially derived from the other type by its inclusion in a union.
DERIVATION_LIST	0x00000008	The target type is a list of items ...