Problem getting the right output from my typed dataset

[TheLongshot]

I have a typed dataset which I used to generate an export file in XML
which is consumed by another program. What I'm having a problem is
that some of the elements aren't coming out the way I need them.

For example, I have a section (which is a child table for my record)
which keeps track of security accesses. The problem is, I need the
output to come out like this:

<SecurityAccess>
<Access>AA</Access>
<Access>BB</Access>
</SecurityAccess>

Instead, it comes out like this:

<SecurityAccess>
<Access>AA</Access>
</SecurityAccess>
<SecurityAccess>
<Access>BB</Access>
</SecurityAccess>

How do I get it to come out the way I want it to?

The schema fragment that defines this section:

<xs:element name="SecurityAccess" minOccurs="0" maxOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element name="Access" type="AccessType" minOccurs="1"
maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>

With Access Type defined as a xs:string with restrictions.

Any suggestions?