Fix legal notice on old public domain XEPs

I have no idea if any of this makes sense legally, so just leave it as
it was before (except make it match the DTD so the linter won't
complain).

.travis.yml

@@ -3,10 +3,5 @@ addons:
     packages:
       - xsltproc
       - libxml2-utils
-before_install:
-  - wget -O git-ratchet https://github.com/iangrunert/git-ratchet/releases/download/v0.3.1/linux_amd64_git-ratchet
-  - chmod +x git-ratchet
-  - git fetch https://github.com/xsf/xeps.git refs/notes/*:refs/notes/*
 script:
   - make all
-  - echo "lint,$(xmllint --nonet --noout --noent --loaddtd --valid *.xml 2>&1 | wc -l)" | ./git-ratchet check -v

Makefile

@@ -46,9 +46,7 @@ xep-%.pdf: $(OUTDIR)/xep-%.pdf ;
 dependencies: $(OUTDIR)/prettify.css $(OUTDIR)/prettify.js $(OUTDIR)/xmpp.css ;
 
 $(OUTDIR)/%.html: %.xml $(XMLDEPS) dependencies
-	# TODO: After existing issues are worked out this and the ratcheting CI build
-	#       should be removed and become an error, not just a warning.
-	xmllint --nonet --noout --noent --loaddtd --valid "$<" || true
+	xmllint --nonet --noout --noent --loaddtd --valid "$<"
 	# Check for non-data URIs
 	! xmllint --nonet --noout --noent --loaddtd --xpath "//img/@src[not(starts-with(., 'data:'))]" $< 2>/dev/null && true
 
@@ -59,9 +57,7 @@ $(OUTDIR)/xmpp.pdf $(OUTDIR)/xmpp-text.pdf:
 	cp "resources/$(notdir $@)" "$@"
 
 $(OUTDIR)/%.pdf: %.xml $(TEXMLDEPS) $(XMLDEPS) dependencies
-	# TODO: After existing issues are worked out this and the ratcheting CI build
-	#       should be removed and become an error, not just a warning.
-	xmllint --nonet --noout --noent --loaddtd --valid "$<" || true
+	xmllint --nonet --noout --noent --loaddtd --valid "$<"
 	# Check for non-data URIs
 	! xmllint --nonet --noout --noent --loaddtd --xpath "//img/@src[not(starts-with(., 'data:'))]" $< 2>/dev/null && true
 

xep-0017.xml

@@ -8,7 +8,7 @@
 <header>
 <title>Naive Packet Framing Protocol</title>
 <abstract>An intermediate method for more efficient framing of the Jabber XML Stream.</abstract>
-<legal>This document has been placed in the public domain.</legal>
+&PUBLICDOMAINNOTICE;
 <number>0017</number>
 <status>Rejected</status>
 <type>Informational</type>

xep-0024.xml

@@ -8,7 +8,7 @@
 <header>
   <title>Publish/Subscribe</title>
   <abstract>A publish-subscribe protocol for Jabber.</abstract> 
-  <legal>This document has been placed in the public domain.</legal>
+  &PUBLICDOMAINNOTICE;
   <number>0024</number>
   <status>Retracted</status>
   <type>Standards Track</type>

xep-0037.xml

@@ -8,7 +8,7 @@
 <header>
   <title>DSPS - Data Stream Proxy Service</title>
   <abstract>A proposal for proxy support in Jabber.</abstract>
-  <legal>This document has been placed in the public domain.</legal>
+  &PUBLICDOMAINNOTICE;
   <number>0037</number>
   <status>Rejected</status>
   <type>Standards Track</type>

xep.ent

@@ -230,6 +230,20 @@ THE SOFTWARE.
 <conformance>This XMPP Extension Protocol has been contributed in full conformance with the XSF's Intellectual Property Rights Policy (a copy of which can be found at &lt;<link url='http://xmpp.org/about-xmpp/xsf/xsf-ipr-policy/'>http://xmpp.org/about-xmpp/xsf/xsf-ipr-policy/</link>&gt; or obtained by writing to XMPP Standards Foundation, P.O. Box 787, Parker, CO 80134 USA).</conformance>
 </legal>" >
 
+<!-- NOTE: New XEPs should not use this. Use LEGALNOTICE. -->
+<!ENTITY PUBLICDOMAINNOTICE "
+<legal>
+<copyright>This document has been placed in the public domain.</copyright>
+<!-- These probably need to be fixed, but they weren't in the documents this
+		 entity replaces and I have no idea if adding them makes any sense legally.
+		 Needs expert review.
+-->
+<permissions/>
+<warranty/>
+<liability/>
+<conformance/>
+</legal>" >
+
 <!-- other XSF-related text shortcuts -->
 
 <!ENTITY BOOLEANNOTE "<note>In accordance with Section 3.2.2.1 of <cite>XML Schema Part 2: Datatypes</cite>, the allowable lexical representations for the xs:boolean datatype are the strings &quot;0&quot; and &quot;false&quot; for the concept 'false' and the strings &quot;1&quot; and &quot;true&quot; for the concept 'true'; implementations MUST support both styles of lexical representation.</note>" >