> Is there any way to make the loop work without removing the namespace
> attribtue.

this is a FAQ.

You just have to select the element.

<xsl:for-each select="//ActivityHeader">

selects ActivityHeader elements in no-namespace and there are none of
those in your document, you want to select ActivityHeader in http://tempuri2.org

so add

xmlns:t="http://tempuri2.org"  to your xsl:stylesheet element then you
can refer to elements in this namespace:

<xsl:for-each select="//t:ActivityHeader">


David

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