mapping columns in CQWP

I have a content query web part, with custom item style template, I defined variables in the templates as :

 <xsl:variable name="myfield1">
      <xsl:value-of select="@myfield1" />
    </xsl:variable>

so later I can use them in my <div class="link-item"> like this:

<span>{$myfield1} </span>

so basically I want to show a field in my list to appear in my style, but now it displays the field in the web part's properties so I can point this property to my field. Is there a way to just add a reference to this field in my xslt? So that a user when he wants to use the same CQWP somewhere else, they don't have to do the mapping? I am new to this, thanks for the help.