Chapter 8: Supported Elements and Declarations for Schemas

The following tables outline how Message Bridge supports both Document Type Definitions (DTD) and XML Schema (XSD). Each of the declarations and elements listed in these tables are supported, either fully or partially. Where there is not full support, the extent of the support is described in the Comments column.

Message Bridge is capable of importing DTDs and XSDs with these declarations and elements, and it generates the Java code necessary for implementing each of the features in Message Bridge DataBeans.

The following table shows the elements for which Message Bridge provides either full or partial support.

Elements that are part of the W3C XML Schema structure that are not listed in the following table are not supported in this release.

**Table 8-1: Supported elements for XML Schemas (XSDs)**
Elements	Can include	Comments
all
	annotation
	element
any		Its attributes are currently not used for code generation.
attribute
attribute	simpleType
attributeGroup
	attribute
	attributeGroup
choice		xsd:any currently only shows by itself under xsd:choice.
	any	Does not support multiple any or any mixed with elements.
	choice
	element
	group
	sequence
complexContent
	extension
	restriction	xsd:restriction for xsd:complexContent should have all its base type members, plus the restriction.
complexType		Its attribute final, block, and abstract are currently not used for code generation.
	all
	attribute
	attributeGroup
	choice
	complexContent
	group
	sequence
	simpleContent
element		final, block, and abstract attributes are currently not used for code generation.
	complexType
	key
	keyref
	simpleType
	unique
enumeration
extension
	attribute
	attributeGroup
field
group
	all
	choice
	sequence
key
	field
	selector
keyref
	field
	selector
restriction
	enumeration	Used for XML document validation.
	fractionDigits
	length
	maxExclusive
	maxInclusive
	maxLength
	minExclusive
	minInclusive
	minLength
	pattern
	simpleType
	totalDigits
	whiteSpace
schema		Currently, blockDefault, finalDefault, version, xml:lang attributes and esd:include, xsd:import, and xsd:redefine content are not supported.
	attribute
	attributeGroup
	complexType
	element
	group
	notation
	simpleType
selector
selector	annotation
sequence		xsd:any only shows by itself under xsd:choice.
	any
	choice
	element
	group
	sequence
simpleContent
	extension
	restriction
simpleType		Currently, xsd:list and xsd:union content are not supported.
simpleType	restriction
unique
	field
	selector

The following table shows the declarations for which Message Bridge provides either full or partial support.

**Table 8-2: Supported declarations for Document Type Definitions (DTDs)**
Declaration	Can include	Comments
DOCTYPE
ELEMENT
	, (comma)	Sequence of elements, AND operator
	\| (bar)	OR operator
	() (parenthesis)	Content grouping
	? (question mark)	Optional, 0 or 1 occurances
	+ (plus)	at least one, 1 or more occurrences
	* (asterisk)	any number, 0 or more occurrences
	EMPTY
	ANY
	PCDATA
ATTLIST
	CDATA
	NMTOKEN
	NMTOKENS	Validation is using attached DTD.
	ID	Validation is using attached DTD.
	IDREF	Validation is using attached DTD.
	IDREFS	Validation is using attached DTD.
	ENTITY	Validation is using attached DTD.
	ENTITIES	Validation is using attached DTD.
	Enumerated value list	Validation is using attached DTD.
	NOTATION	Validation is using attached DTD.
	DEFAULT or default value assigned
	IMPLIED
	REQUIRED
	FIXED
NOTATION
ENTITY
	parameter entity
	internal entity
	SYSTEM ID (External parsed entity)
	PUBLIC ID (External parsed entity)	Handled the same as SYSTEM ID.
	SYSTEM ID (External unparsed entity)	Passed on to DTD generation.
	PUBLIC ID (External unparsed entity)	Passed on to DTD generation.

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