Can attribute in FetchXML accept default value?

Hello,

I have a situation where I would like to use FetchXML as Dynamics CRM  Source in SSIS package. 

I would like to know whether we can pass certain specific value as default in attribute as part of FetchXML?

Something I am looking for is as below.

<fetch top="50" >
<entity name="entity1" >

<attribute name="anything1" alias="a" value="default1" />

<attribute name="anything2" alias="b" value="default2" />

</entity>

</fetch>