Specifying Shema

[spasala]

Hello All,

I have an xml element namely

<csharpAttr>"[DllImport("user32.dll", SetLastError=false,
ExactSpelling=false)]"</csharpAttr>

the value of tha element could be anything for example

<csharpAttr>"[Conditional("DEBUG"), Conditional("TEST1")]"
</csharpAttr>
now I want to create a schema for this "charpAttr" element .
So the idea is the value should always start with a "[" and end with
"]"
So how do I specify the
pattern value
in the following

<xs:simpleType name="charpAttrType">
<xs:restriction base="xs:string">
<xs:pattern value= ???????/>
</xs:restriction>
</xs:simpleType>

Or if any body could suggest an alternate way (probably a better way)
that would be awesome.

Thanks in advance
sP