![]() Uniqueness ConstraintEnsures uniqueness of an element/attribute value, or a combination of values, within a specified scope. If no target namespace is provided, then the schema components do not belong to any namespace. Target NamespaceThe target namespace identifies the namespace that components in this schema belongs to. Prohibits element declarations from nominating themselves as being able to substitute a given element declaration, if they have types that are derived from the original element's type using the specified derivation methods. Substitution Group Exclusions(Applies to element declarations). Substitution GroupElements that are members of a substitution group can be used wherever the head element of the substitution group is referenced. Sequence Model GroupChild elements and model groups must be provided in the specified order in instances. Replace Whitespace PolicyReplace tab, line feed, and carriage return characters with space character (Unicode character 32). Prevents sub-types that have been derived using the specified derivation methods from validating element instances in place of the given type definition. Prohibited Substitutions(Applies to complex type definitions). Derivation methods that cannot be used to create sub-types from a given type definition. Prohibited Derivations(Applies to type definitions). Preserve Whitespace PolicyPreserve whitespaces exactly as they appear in instances. Values of elements and attributes that are of type, NOTATION, must come from the names of declared notations. ![]() NotationA notation is used to identify the format of a piece of data. If an element instance has an xsi:nil attribute set to true, it can be left empty, even though its element declaration may have required content. The xsi:nil attribute is the boolean attribute, nil, from the namespace. If an element declaration is nillable, instances can use the xsi:nil attribute. Nillable(Applies to element declarations). Model GroupGroups together element content, specifying the order in which the element content can occur and the number of times the group of element content may be repeated. ![]() Key Reference ConstraintEnsures that the specified value(s) must match value(s) from a Key Constraint or Uniqueness Constraint. Key ConstraintLike Uniqueness Constraint, but additionally requires that the specified value(s) must be provided. Normally, element instances can override their declaration's type by specifying an xsi:type attribute. extension, restriction, are specified, then the given element declaration will not validate element instances that have types derived from the element declaration's type using the specified derivation methods. ![]() If substitution is specified, then substitution group members cannot be used in place of the given element declaration to validate element instances. Then, collapse contiguous sequences of space characters into single space character, and remove leading and trailing space characters.ĭisallowed Substitutions(Applies to element declarations). Ĭollapse Whitespace PolicyReplace tab, line feed, and carriage return characters with space character (Unicode character 32). Ĭhoice Model Group Only one from the list of child elements and model groups can be provided in instances. For references to abstract type definitions, only derived types can be used.Īll Model GroupChild elements can be provided in any order in instances. If there is a reference to an abstract element, only element declarations that can substitute the abstract element can be used to validate the instance. An abstract element or complex type cannot used to validate an element instance. Abstract(Applies to complex type definitions and element declarations). ![]()
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