BlockDefault (Node Property of All Schemas)

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Use the BlockDefault property to prevent or restrict the types of derivations that can be used in instance messages for all data types defined by the schema being edited.

Applies to Nodes of Type

Schema

Category

Advanced

Allowed Values

Drop-down list choice Description
(Default) Removes the blockDefault attribute, if present, specifying that there are no restrictions on particular types of derivations that apply throughout the entire schema.
All Sets the blockDefault attribute to "#all", specifying that no derivations are allowed.
Restriction Adds "restriction" to the value of the blockDefault attribute, specifying that derivations by restriction are not allowed.
Extension Adds "extension" to the value of the blockDefault attribute, specifying that derivations by extension are not allowed.
Substitution Adds "substitution" to the value of the blockDefault attribute, specifying that derivations by substitution are not allowed.

Default Value

(Default), resulting in no global restrictions on deriving from the types in the schema being edited.

XSD Persistence

As the value of the blockDefault attribute of the schema element.

Remarks

You can examine and set this property in the Visual Studio Properties window when you select the Schema node in BizTalk Editor.

The values Restriction, Extension, and Substitution can be set in combination with each other by selecting their corresponding check boxes in the BlockDefault property drop-down list. The corresponding values of the blockDefault attribute are space-separated.

You can override the global setting established by this property by setting the Block property of individual Record nodes.

In corresponding instance messages, other derived data types can be used for a particular element unless explicitly prevented by the settings of the Block and/or BlockDefault properties, as follows:

<RecordName   
            xmlns:xsi="http://www.w3c.org/2001/XMLSchema-instance>"

In the example above, "BaseOrDerivedTypeName" is the name of a complex type that is derived from the data type specified by the Data Structure Type property of the corresponding Record node by some allowed type of derivation (a type of derivation that is not blocked by this property or the BlockDefault property). For more information about different types of derivations, see Type Reuse and Derivations.

See Also

Node Properties of All Schemas