Multiple Values in Variable

Hi,

I am using this tool for the first time. I am writing a code in executeXMLQuery and I need to pass more than one value under Variable. 

This is what the code looks like:

<v6:variables>
<v6:name>PRODUCT</v6:name>
<v6:value>ABC</v6:value>
</v6:variables>

When I execute the code, I get details where Product = ABC. Now, I want to get details where Product is either ABC or XYZ. I tried all of these:

<v6:variables>
<v6:name>PRODUCT</v6:name>
<v6:value>ABC</v6:value>

<v6:value>XYZ</v6:value>
</v6:variables>

<v6:variables>
<v6:name>PRODUCT</v6:name>
<v6:value>ABC,XYZ</v6:value>

</v6:variables>

<v6:variables>
<v6:name>PRODUCT</v6:name>
<v6:value>ABC;XYZ</v6:value>

</v6:variables>

None is working. Can you please help me?