You could write it in the stylesheet as:

<SummaryViewDataSet
     xmlns="http://www.miltonstreet.com/SummaryViewDataSet.xsd">
     <!-- more stuff here, of course -->
</SummaryViewDataSet>

I tried that, for some reason the next element, which is
<ScheduleLines> ends up getting an empty xmlns attribute.  Here is the
complete XSLT:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

	<xsl:template match="/Report">
		<SummaryViewDataSet
xmlns="http://www.miltonstreet.com/SummaryViewDataSet.xsd">
			<xsl:apply-templates select="schedule/schGrps/schGrp/schLine"/>
		</SummaryViewDataSet>
	</xsl:template>
	
	<xsl:template match="schLine">
   <ScheduleLines>
       <schGrpOID><xsl:value-of select="../@objectID"/></schGrpOID>
       <schLineOID><xsl:value-of select="@objectID"/></schLineOID>

       <xsl:if test="../@stdOID">
         <stdOID><xsl:value-of select="../@stdOID"/></stdOID>
       </xsl:if>

       <schGrpType><xsl:value-of select="../@type"/></schGrpType>
       <vialPosition><xsl:value-of select="@position"/></vialPosition>

       <xsl:if test="@sampleID">
         <sampleID><xsl:value-of select="@sampleID"/></sampleID>
       </xsl:if>

       <xsl:if test="results/result[1]">
         <result><xsl:value-of select="results/result[1]/average"/></result>
         <stdDev><xsl:value-of select="results/result[1]/stdDev"/></stdDev>
         <rsd><xsl:value-of select="results/result[1]/rsd"/></rsd>
       </xsl:if>

       <xsl:if test="metadata/methodDoc">
         <methodOID><xsl:value-of select="metadata/methodDoc"/></methodOID>
         <methodVersion><xsl:value-of
select="metadata/methodDoc/@version"/></methodVersion>
       </xsl:if>

       <xsl:if test="metadata/calDoc">
         <calOID><xsl:value-of select="metadata/calDoc"/></calOID>
         <calVersion><xsl:value-of
select="metadata/calDoc/@version"/></calVersion>
         <calRevision><xsl:value-of
select="metadata/calDoc/@revision"/></calRevision>
       </xsl:if>

       <blankOID><xsl:value-of select="metadata/blankDoc"/></blankOID>
       <blankVersion><xsl:value-of
select="metadata/blankDoc/@version"/></blankVersion>
       <blankRevision><xsl:value-of
select="metadata/blankDoc/@revision"/></blankRevision>
       <startTime><xsl:value-of select="results/@shortStartTime"/></startTime>
   </ScheduleLines>
	</xsl:template>	
	
</xsl:stylesheet>

<?xml version="1.0" encoding="UTF-8"?>
<SummaryViewDataSet xmlns="http://www.miltonstreet.com/SummaryViewDataSet.xsd">
<ScheduleLines xmlns="">
<schGrpOID>2</schGrpOID>
<schLineOID>1</schLineOID>
<schGrpType>SchSampleGroup</schGrpType>
<vialPosition>4</vialPosition>
<sampleID></sampleID>
<methodOID>16bd8d88-7af2-4feb-8de7-0855b22eeec3</methodOID>
<methodVersion>1</methodVersion>
<calOID>78f0f1ec-6a4a-4d76-9955-bf48f3e7e5a4</calOID>
<calVersion>1</calVersion>
<calRevision>0</calRevision>
<blankOID>242adcf2-981d-4eaf-a47d-07e1cd48b166</blankOID>
<blankVersion>3</blankVersion>
<blankRevision>0</blankRevision>
<startTime>01:27 PM (-04:00)</startTime>
</ScheduleLines>
</SummaryViewDataSet>

<xsl:template match="/Report">
 <SummaryViewDataSet> <!-- </SummaryViewDataSet>
xmlns="http://www.miltonstreet.com/SummaryViewDataSet.xsd"> -->
   <xsl:apply-templates select="schedule/schGrps/schGrp/schLine"/>
 </SummaryViewDataSet>
</xsl:template>

<?xml version="1.0" encoding="UTF-8"?>
<SummaryViewDataSet>
<ScheduleLines>
<schGrpOID>2</schGrpOID>
<schLineOID>1</schLineOID>
<schGrpType>SchSampleGroup</schGrpType>
<vialPosition>4</vialPosition>
<sampleID></sampleID>
<methodOID>16bd8d88-7af2-4feb-8de7-0855b22eeec3</methodOID>
<methodVersion>1</methodVersion>
<calOID>78f0f1ec-6a4a-4d76-9955-bf48f3e7e5a4</calOID>
<calVersion>1</calVersion>
<calRevision>0</calRevision>
<blankOID>242adcf2-981d-4eaf-a47d-07e1cd48b166</blankOID>
<blankVersion>3</blankVersion>
<blankRevision>0</blankRevision>
<startTime>01:27 PM (-04:00)</startTime>
</ScheduleLines>
</SummaryViewDataSet>

P.S. Mike, I have your book, XSLT 2nd Edition, which I live/died by
when doing XSLT programming, thanks!
--
Miltonstreet Photography
http://www.miltonstreet.com