problem in xsd file containing the xml element wsi:swaRef which refers to attachment

[sreeni1982]

Hi I have an xsd file containing the following

</complexType>
<xsd:complexType name="SimpleSwaType">
<xsd:sequence>
<xsd:element name="Attachment" type="wsi:swaRef"></xsd:element>
</xsd:sequence>
</xsd:complexType>

I have defined the namespace for wsi prefix as follows:

xmlns:wsi="http://ws-i.org/profiles/basic/1.1/xsd"

But its showing error at the highlighted line.

I am not able to trace out the issue. Googled and found that the same issue is being faced by many people.

Please assist.

Thanks in advance

Regards,
sreeni.