repeating elements in a sequence

I want some child elements in an element to repeat. But I also don't care what order. I cant use the "all" compositor because the maxOccurance can only be 1. Here's what I have tried but I still don't have the result I want. The way I thought this should work is "line" and "field" should repeat as many times as needed.

<xsd:element name="group">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="name" minOccurs = "1" maxOccurs ="1"/>
<xsd:choice minOccurs = "0" maxOccurs = "unbounded">
<xsd:element ref="line" minOccurs = "0" maxOccurs = "unbounded"/>
<xsd:element ref="field" minOccurs = "0" maxOccurs = "unbounded"/>
</xsd:choice>
<xsd:element ref="TextFieldGroup" minOccurs = "0" maxOccurs = "unbounded"/>
</xsd:sequence>
<xsd:attribute name="groupType" use = "optional"/> </xsd:complexType>
</xsd:element>

Any ideas on what I can do?

nay