XML-XSD file creation

I am creating a XML schema file I am struck at one point If any of you can help me please do it.

I have a element like this

<xs:element name="Country_name" minOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:maxLength value="50" />
</xs:restriction>
</xs:simpleType>
</xs:element>

Thing i wanted is that if this country_name element holds a value "GREECE" in the XML file another element i.e the one shown below
should be mandatory else it should not be mandatory

<xs:element name="University" minOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:maxLength value="50" />
</xs:restriction>
</xs:simpleType>
</xs:element>

Can it be done in scheam i.e ina .xsd file?

Aslo another need is that based on value on One element i need to choose one of the two elements

like if element type==kid

i should have a element ice cream

else if type = men

i should have a element noodles can this selection of element based on the data on tag be done in xsd file

I am a GreenHorn..so please help

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