some $QualifedName in expression satisfies expression 
every $QualifedName in expression satisfies expression 
Both return boolean values, true or false
<xsl:template match="weblogs">
  <xsl:if test="some $log in log satisfies changesURL">
     ????
  </xsl:if>
</xsl:template>
<xsl:template match="weblogs">
  <xsl:if test="every $log in log satisfies url">
    ????
  </xsl:if>
</xsl:template>