Setting an attribute back to null

Hi All.
During provisioning to certain resource, I set an attribute to some value (It gets set properly), Now I want to set it back to null(empty string). It is not setting back to null and still displays the old value
<set name='user.global.attr1'>
<null/> or <s></s>
</set>
Is there any way to set the attribute value back to null or clear that particular attribute
Thanks,

Any update on this, Please reply

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Setting an attribute back to null

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