Por que recebo uma saída vazia? Quando eu removo a parte xmlns no xml, a saída é a esperada, mas o intellisense não funciona mais.

warehouse.xml

<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type="text/xsl" href="warehouse.xsl"?>
<warehouse xmlns="http://schema.mynamespace.net">
  <container>
    <item>
      <name>book</name>
      <value>1.23</value>
    </item>
    <item>
      <name>phone</name>
      <value>45.6</value>
    </item>
  </container>
</warehouse>

warehouse.xsl

<xsl:stylesheet xmlns="http://schema.mynamespace.net" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output method="text"/>

<xsl:template match="/">
  <xsl:apply-templates select="warehouse/container" />"
</xsl:template>

<xsl:template match="container">
  <xsl:apply-templates />"
</xsl:template>

</xsl:stylesheet>