Add any to complexType - xsd

Question

I have this XML schema:
<xs:element name="lineinfo">
<xs:complexType>
<xs:all>
<xs:element name="done" type="xs:unsignedInt" />
</xs:all>
<xs:attribute name="id" type="xs:long" />
<xs:anyAttribute processContents="skip" />
</xs:complexType>
</xs:element>
but I want to allow any other extra element in the lineinfo tag:
<lineinfo state="assigned" id="175">
<done>4</done>
<todo>6</todo>
</lineinfo>
I tried to add <xs:any /> inside the <xs:all>, but it doesn't seem to be allowed.

Answer 1

I couldn't find a way to do what I wanted, so I ended up adding all "unwanted" tags in my list, with minOccurs set to 0:
<xs:element name="lineinfo">
<xs:complexType>
<xs:all>
<xs:element name="done" type="xs:unsignedInt" />
<xs:element name="todo" minOccurs="0" />
<xs:element name="error" minOccurs="0" />
</xs:all>
<xs:attribute name="id" type="xs:long" />
<xs:anyAttribute processContents="skip" />
</xs:complexType>
</xs:element>

Answer 2

Parent tag of <xs:any> are only choice, sequence. w3cschools #el_any
To use <xs:any> put <xs:sequence> instead of <xs:all>. w3cschools #any
else you could use xs:anyType
xs:anyType is a type, like xs:integer (though xs:anyType is special
in that it can act as a simple or complex type, and it places
essentially no restrictions on the tree that it validates -- think of
it loosely as the Schema language's analog of java.lang.Object).
A sample use would be:
<xsd:element name="value" type="xs:anyType"/>
Anyway if you want use below an example taken from w3cschools #anyattribute
SCHEMA
<xs:element name="person">
<xs:complexType>
<xs:sequence>
<xs:element name="firstname" type="xs:string"/>
<xs:element name="lastname" type="xs:string"/>
</xs:sequence>
<xs:anyAttribute/>
</xs:complexType>
</xs:element>
<xs:attribute name="gender">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value="male|female"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
XML
<person gender="female">
<firstname>Hege</firstname>
<lastname>Refsnes</lastname>
</person>