--- a/ttml2/spec/ttml2.xml	Sat May 24 11:44:14 2014 +0800
+++ b/ttml2/spec/ttml2.xml	Sat May 24 11:51:36 2014 +0800
@@ -2714,14 +2714,16 @@
 (1) the <att>extends</att> attribute is specified on the root <el>tt</el> element,
 (2) the computed value of the <att>extends</att> attribute designates a feature that is implemented or otherwise supported by
 a processor, and
-(3) the computed value of the <att>ttp:permitFeatureNarrowing</att> parameter attribute of the root <el>tt</el> element is not <code>false</code>,
+(3) the computed value of the <loc href="#parameter-attribute-permitFeatureNarrowing"><att>ttp:permitFeatureNarrowing</att></loc>
+parameter attribute of the root <el>tt</el> element is not <code>false</code>,
 then continue processing the document;</p>
 </item>
 <item><p>otherwise, if
 (1) the <att>restricts</att> attribute is specified on the root <el>tt</el> element,
 (2) the computed value of the <att>restricts</att> attribute designates a feature that is implemented or otherwise supported by
 a processor, and
-(3) the computed value of the <att>ttp:permitFeatureWidening</att> parameter attribute of the root <el>tt</el> element is not <code>false</code>,
+(3) the computed value of the <loc href="#parameter-attribute-permitFeatureWidening"><att>ttp:permitFeatureWidening</att></loc>
+parameter attribute of the root <el>tt</el> element is not <code>false</code>,
 then continue processing the document;</p>
 </item>
 <item><p>otherwise, abort processing the document unless overridden by the end-user or some implementation specific parameter
@@ -2920,14 +2922,16 @@
 (1) the <att>extends</att> attribute is specified on the root <el>tt</el> element,
 (2) the computed value of the <att>extends</att> attribute designates an extension that is implemented or otherwise supported by
 a processor, and
-(3) the computed value of the <att>ttp:permitFeatureNarrowing</att> parameter attribute of the root <el>tt</el> element is not <code>false</code>,
+(3) the computed value of the <loc href="#parameter-attribute-permitFeatureNarrowing"><att>ttp:permitFeatureNarrowing</att></loc>
+parameter attribute of the root <el>tt</el> element is not <code>false</code>,
 then continue processing the document;</p>
 </item>
 <item><p>otherwise, if
 (1) the <att>restricts</att> attribute is specified on the root <el>tt</el> element,
 (2) the computed value of the <att>restricts</att> attribute designates an extension that is implemented or otherwise supported by
 a processor, and
-(3) the computed value of the <att>ttp:permitFeatureWidening</att> parameter attribute of the root <el>tt</el> element is not <code>false</code>,
+(3) the computed value of the <loc href="#parameter-attribute-permitFeatureWidening"><att>ttp:permitFeatureWidening</att></loc>
+parameter attribute of the root <el>tt</el> element is not <code>false</code>,
 then continue processing the document;</p>
 </item>
 <item><p>otherwise, abort processing the document unless overridden by the end-user or some implementation specific parameter