why?

TSD4 is a subset of XML schema. This subset will be extended from version to version. The long term goal is to capture the entire XML schema.
However a new version of the Tamino Schema Editor will convert your schemas to TSD4.

Dear Cowboy,

You could download the Tamino Schema Conversion tool 4.1.1 in this community which provide an automatic construct conversion for some unSupported syntax(e.g. xs:group, xs:attributeGroup etc.). So that it can be defined in Tamino.

For example, the following xs:group construct can be converted as:

<xs:element name=“usingGroup”>
xs:complexType
xs:choice
<xs:group ref=“refgroup”/>
</xs:choice>
</xs:complexType>
</xs:element>
<xs:group name=“refgroup”>
xs:sequence
<xs:element name="elem1?
type=“xs:string”/>
<xs:element name="elem2?
type=“xs:string”/>
</xs:sequence>
</xs:group>

… is converted to …

<xs:element name=“usingGroup”>
xs:complexType
xs:choice
xs:sequence
<xs:element name=“elem1” type=“xs:string”/>
<xs:element name=“elem2” type=“xs:string”/>
</xs:sequence>
</xs:choice>
</xs:complexType>
</xs:element>


Regards,

Tony