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<?xml version="1.0"?>
<!DOCTYPE doc [
<!ATTLIST normId attr NMTOKENS #IMPLIED>
]>
<doc>
  <!-- no normalization -->
  <norm attr="   "/>
  <norm attr="   foo bar   "/>
  <norm attr="  foobar"/>
  <norm attr=" foo bar "/>
  <norm attr="foobar  "/>
  <norm attr=" &amp; "/>
  <norm attr="   foo&amp;bar   "/>
  <norm attr="  foobar&amp;"/>
  <norm attr="&amp;foo bar "/>
  <norm attr="foobar  &amp;"/>
  <norm attr=" &lt; "/>
  <norm attr="   foo&lt;bar   "/>
  <norm attr="  foobar&lt;"/>
  <norm attr="&lt;foo bar "/>
  <norm attr="foobar  &lt;"/>
  <norm attr="  &#13;&#10;&#9; "/>
  <!-- normalization -->
  <normId attr=""/>
  <normId attr="foo bar"/>
  <normId attr="foobar"/>
  <normId attr="foo bar"/>
  <normId attr="foobar"/>
  <normId attr="&amp;"/>
  <normId attr="foo&amp;bar"/>
  <normId attr="foobar&amp;"/>
  <normId attr="&amp;foo bar"/>
  <normId attr="foobar &amp;"/>
  <normId attr="&lt;"/>
  <normId attr="foo&lt;bar"/>
  <normId attr="foobar&lt;"/>
  <normId attr="&lt;foo bar"/>
  <normId attr="foobar &lt;"/>
  <normId attr="&#13;&#10;&#9;"/> <!-- PBM serializing back -->
</doc>