bpo-13611: C14N 2.0 implementation for ElementTree (GH-12966)

* Implement C14N 2.0 as a new canonicalize() function in ElementTree.

Missing features:
- prefix renaming in XPath expressions (tag and attribute text is supported)
- preservation of original prefixes given redundant namespace declarations

Doc/library/xml.etree.elementtree.rst

@@ -465,6 +465,53 @@ Reference
 Functions
 ^^^^^^^^^
 
+.. function:: canonicalize(xml_data=None, *, out=None, from_file=None, **options)
+
+   `C14N 2.0 <https://www.w3.org/TR/xml-c14n2/>`_ transformation function.
+
+   Canonicalization is a way to normalise XML output in a way that allows
+   byte-by-byte comparisons and digital signatures.  It reduced the freedom
+   that XML serializers have and instead generates a more constrained XML
+   representation.  The main restrictions regard the placement of namespace
+   declarations, the ordering of attributes, and ignorable whitespace.
+
+   This function takes an XML data string (*xml_data*) or a file path or
+   file-like object (*from_file*) as input, converts it to the canonical
+   form, and writes it out using the *out* file(-like) object, if provided,
+   or returns it as a text string if not.  The output file receives text,
+   not bytes.  It should therefore be opened in text mode with ``utf-8``
+   encoding.
+
+   Typical uses::
+
+      xml_data = "<root>...</root>"
+      print(canonicalize(xml_data))
+
+      with open("c14n_output.xml", mode='w', encoding='utf-8') as out_file:
+          canonicalize(xml_data, out=out_file)
+
+      with open("c14n_output.xml", mode='w', encoding='utf-8') as out_file:
+          canonicalize(from_file="inputfile.xml", out=out_file)
+
+   The configuration *options* are as follows:
+
+   - *with_comments*: set to true to include comments (default: false)
+   - *strip_text*: set to true to strip whitespace before and after text content
+                   (default: false)
+   - *rewrite_prefixes*: set to true to replace namespace prefixes by "n{number}"
+                         (default: false)
+   - *qname_aware_tags*: a set of qname aware tag names in which prefixes
+                         should be replaced in text content (default: empty)
+   - *qname_aware_attrs*: a set of qname aware attribute names in which prefixes
+                          should be replaced in text content (default: empty)
+   - *exclude_attrs*: a set of attribute names that should not be serialised
+   - *exclude_tags*: a set of tag names that should not be serialised
+
+   In the option list above, "a set" refers to any collection or iterable of
+   strings, no ordering is expected.
+
+   .. versionadded:: 3.8
+
 
 .. function:: Comment(text=None)
 
@@ -1114,6 +1161,19 @@ TreeBuilder Objects
       .. versionadded:: 3.8
 
 
+.. class:: C14NWriterTarget(write, *, \
+             with_comments=False, strip_text=False, rewrite_prefixes=False, \
+             qname_aware_tags=None, qname_aware_attrs=None, \
+             exclude_attrs=None, exclude_tags=None)
+
+   A `C14N 2.0 <https://www.w3.org/TR/xml-c14n2/>`_ writer.  Arguments are the
+   same as for the :func:`canonicalize` function.  This class does not build a
+   tree but translates the callback events directly into a serialised form
+   using the *write* function.
+
+   .. versionadded:: 3.8
+
+
 .. _elementtree-xmlparser-objects:
 
 XMLParser Objects

Doc/whatsnew/3.8.rst

@@ -525,6 +525,10 @@ xml
   external entities by default.
   (Contributed by Christian Heimes in :issue:`17239`.)
 
+* The :mod:`xml.etree.ElementTree` module provides a new function
+  :func:`–xml.etree.ElementTree.canonicalize()` that implements C14N 2.0.
+  (Contributed by Stefan Behnel in :issue:`13611`.)
+
 
 Optimizations
 =============

Lib/test/xmltestdata/c14n-20/c14nComment.xml

+<dsig:CanonicalizationMethod xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:c14n2="http://www.w3.org/2010/xml-c14n2" Algorithm="http://www.w3.org/2010/xml-c14n2">
+ <c14n2:IgnoreComments>true</c14n2:IgnoreComments>
+</dsig:CanonicalizationMethod>
+

Lib/test/xmltestdata/c14n-20/c14nDefault.xml

+<dsig:CanonicalizationMethod xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" Algorithm="http://www.w3.org/2010/xml-c14n2">
+</dsig:CanonicalizationMethod>
+

Lib/test/xmltestdata/c14n-20/c14nPrefix.xml

+<dsig:CanonicalizationMethod xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:c14n2="http://www.w3.org/2010/xml-c14n2" Algorithm="http://www.w3.org/2010/xml-c14n2">
+ <c14n2:PrefixRewrite>sequential</c14n2:PrefixRewrite>
+</dsig:CanonicalizationMethod>
+

Lib/test/xmltestdata/c14n-20/c14nPrefixQname.xml

+<dsig:CanonicalizationMethod xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:c14n2="http://www.w3.org/2010/xml-c14n2" Algorithm="http://www.w3.org/2010/xml-c14n2">
+  <c14n2:PrefixRewrite>sequential</c14n2:PrefixRewrite>
+  <c14n2:QNameAware>
+   <c14n2:QualifiedAttr Name="type" NS="http://www.w3.org/2001/XMLSchema-instance"/>
+  </c14n2:QNameAware>
+</dsig:CanonicalizationMethod>
+

Lib/test/xmltestdata/c14n-20/c14nPrefixQnameXpathElem.xml

+<dsig:CanonicalizationMethod xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:c14n2="http://www.w3.org/2010/xml-c14n2" Algorithm="http://www.w3.org/2010/xml-c14n2">
+  <c14n2:PrefixRewrite>sequential</c14n2:PrefixRewrite>
+  <c14n2:QNameAware>
+   <c14n2:Element Name="bar" NS="http://a"/>
+   <c14n2:XPathElement Name="IncludedXPath" NS="http://www.w3.org/2010/xmldsig2#"/>
+  </c14n2:QNameAware>
+</dsig:CanonicalizationMethod>
+

Lib/test/xmltestdata/c14n-20/c14nQname.xml

+<dsig:CanonicalizationMethod xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:c14n2="http://www.w3.org/2010/xml-c14n2" Algorithm="http://www.w3.org/2010/xml-c14n2">
+  <c14n2:QNameAware>
+   <c14n2:QualifiedAttr Name="type" NS="http://www.w3.org/2001/XMLSchema-instance"/>
+  </c14n2:QNameAware>
+</dsig:CanonicalizationMethod>
+

Lib/test/xmltestdata/c14n-20/c14nQnameElem.xml

+<dsig:CanonicalizationMethod xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:c14n2="http://www.w3.org/2010/xml-c14n2" Algorithm="http://www.w3.org/2010/xml-c14n2">
+  <c14n2:QNameAware>
+   <c14n2:Element Name="bar" NS="http://a"/>
+  </c14n2:QNameAware>
+</dsig:CanonicalizationMethod>
+

Lib/test/xmltestdata/c14n-20/c14nQnameXpathElem.xml

+<dsig:CanonicalizationMethod xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:c14n2="http://www.w3.org/2010/xml-c14n2" Algorithm="http://www.w3.org/2010/xml-c14n2">
+  <c14n2:QNameAware>
+   <c14n2:Element Name="bar" NS="http://a"/>
+   <c14n2:XPathElement Name="IncludedXPath" NS="http://www.w3.org/2010/xmldsig2#"/>
+  </c14n2:QNameAware>
+</dsig:CanonicalizationMethod>
+

Lib/test/xmltestdata/c14n-20/c14nTrim.xml

+<dsig:CanonicalizationMethod xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" xmlns:c14n2="http://www.w3.org/2010/xml-c14n2" Algorithm="http://www.w3.org/2010/xml-c14n2">
+ <c14n2:TrimTextNodes>true</c14n2:TrimTextNodes>
+</dsig:CanonicalizationMethod>
+

Lib/test/xmltestdata/c14n-20/doc.dtd

+<?xml version="1.0" encoding="UTF-8"?>
+
+<!ELEMENT doc (#PCDATA)>
+
+
+

Lib/test/xmltestdata/c14n-20/doc.xsl

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

Lib/test/xmltestdata/c14n-20/inC14N1.xml

+<?xml version="1.0"?>
+
+<?xml-stylesheet   href="doc.xsl"
+   type="text/xsl"   ?>
+
+<!DOCTYPE doc SYSTEM "doc.dtd">
+
+<doc>Hello, world!<!-- Comment 1 --></doc>
+
+<?pi-without-data     ?>
+
+<!-- Comment 2 -->
+
+<!-- Comment 3 -->

Lib/test/xmltestdata/c14n-20/inC14N2.xml

+<doc>
+   <clean>   </clean>
+   <dirty>   A   B   </dirty>
+   <mixed>
+      A
+      <clean>   </clean>
+      B
+      <dirty>   A   B   </dirty>
+      C
+   </mixed>
+</doc>

Lib/test/xmltestdata/c14n-20/inC14N3.xml

+<!DOCTYPE doc [<!ATTLIST e9 attr CDATA "default">]>
+<doc>
+   <e1   />
+   <e2   ></e2>
+   <e3   name = "elem3"   id="elem3"   />
+   <e4   name="elem4"   id="elem4"   ></e4>
+   <e5 a:attr="out" b:attr="sorted" attr2="all" attr="I'm"
+      xmlns:b="http://www.ietf.org"
+      xmlns:a="http://www.w3.org"
+      xmlns="http://example.org"/>
+   <e6 xmlns="" xmlns:a="http://www.w3.org">
+      <e7 xmlns="http://www.ietf.org">
+         <e8 xmlns="" xmlns:a="http://www.w3.org">
+            <e9 xmlns="" xmlns:a="http://www.ietf.org"/>
+         </e8>
+      </e7>
+   </e6>
+</doc> 

Lib/test/xmltestdata/c14n-20/inC14N4.xml

+<!DOCTYPE doc [
+<!ATTLIST normId id ID #IMPLIED>
+<!ATTLIST normNames attr NMTOKENS #IMPLIED>
+]>
+<doc>
+   <text>First line&#x0d;&#10;Second line</text>
+   <value>&#x32;</value>
+   <compute><![CDATA[value>"0" && value<"10" ?"valid":"error"]]></compute>
+   <compute expr='value>"0" &amp;&amp; value&lt;"10" ?"valid":"error"'>valid</compute>
+   <norm attr=' &apos;   &#x20;&#13;&#xa;&#9;   &apos; '/>
+   <normNames attr='   A   &#x20;&#13;&#xa;&#9;   B   '/>
+   <normId id=' &apos;&#x20;&#13;&#xa;&#9; &apos; '/>
+</doc>

Lib/test/xmltestdata/c14n-20/inC14N5.xml

+<!DOCTYPE doc [
+<!ATTLIST doc attrExtEnt CDATA #IMPLIED>
+<!ENTITY ent1 "Hello">
+<!ENTITY ent2 SYSTEM "world.txt">
+<!ENTITY entExt SYSTEM "earth.gif" NDATA gif>
+<!NOTATION gif SYSTEM "viewgif.exe">
+]>
+<doc attrExtEnt="entExt">
+   &ent1;, &ent2;!
+</doc>
+
+<!-- Let world.txt contain "world" (excluding the quotes) -->

Lib/test/xmltestdata/c14n-20/inC14N6.xml

+<?xml version="1.0" encoding="ISO-8859-1"?>
+<doc>&#169;</doc>

Lib/test/xmltestdata/c14n-20/inNsContent.xml

+<a:foo xmlns:a="http://a" xmlns:b="http://b" xmlns:child="http://c" xmlns:soap-env="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
+ <a:bar>xsd:string</a:bar>
+ <dsig2:IncludedXPath xmlns:dsig2="http://www.w3.org/2010/xmldsig2#">/soap-env:body/child::b:foo[@att1 != "c:val" and @att2 != 'xsd:string']</dsig2:IncludedXPath>
+</a:foo>

Lib/test/xmltestdata/c14n-20/inNsDefault.xml

+<foo xmlns:a="http://a" xmlns:b="http://b">
+ <b:bar b:att1="val" att2="val"/>
+</foo>

Lib/test/xmltestdata/c14n-20/inNsPushdown.xml

+<a:foo xmlns:a="http://a" xmlns:b="http://b" xmlns:c="http://c">
+ <b:bar/>
+ <b:bar/>
+ <b:bar/>
+ <a:bar b:att1="val"/>
+</a:foo>

Lib/test/xmltestdata/c14n-20/inNsRedecl.xml

+<foo xmlns:a="http://z3" xmlns:b="http://z2" a:att1="val1" b:att2="val2"> 
+ <bar xmlns="http://z0" xmlns:a="http://z2" a:att1="val1" b:att2="val2" xmlns:b="http://z3" />
+</foo>

Lib/test/xmltestdata/c14n-20/inNsSort.xml

+<a:foo xmlns:a="http://z3" xmlns:b="http://z2" b:att1="val1" c:att3="val3" b:att2="val2" xmlns:c="http://z1" xmlns:d="http://z0">
+ <c:bar/>
+ <c:bar d:att3="val3"/>
+</a:foo>

Lib/test/xmltestdata/c14n-20/inNsSuperfluous.xml

+<foo xmlns:a="http://z0" xmlns:b="http://z0" a:att1="val1" b:att2="val2" xmlns="http://z0"> 
+ <c:bar xmlns:a="http://z0" xmlns:c="http://z0" c:att3="val3"/>
+ <d:bar xmlns:d="http://z0"/>
+</foo>

Lib/test/xmltestdata/c14n-20/inNsXml.xml

+<foo xmlns="http://z0" xml:id="23">
+  <bar xsi:type="xsd:string" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">data</bar>
+</foo>

Lib/test/xmltestdata/c14n-20/out_inC14N1_c14nComment.xml

+<?xml-stylesheet href="doc.xsl"
+   type="text/xsl"   ?>
+<doc>Hello, world!<!-- Comment 1 --></doc>
+<?pi-without-data?>
+<!-- Comment 2 -->
+<!-- Comment 3 -->
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inC14N1_c14nDefault.xml

+<?xml-stylesheet href="doc.xsl"
+   type="text/xsl"   ?>
+<doc>Hello, world!</doc>
+<?pi-without-data?>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inC14N2_c14nDefault.xml

+<doc>
+   <clean>   </clean>
+   <dirty>   A   B   </dirty>
+   <mixed>
+      A
+      <clean>   </clean>
+      B
+      <dirty>   A   B   </dirty>
+      C
+   </mixed>
+</doc>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inC14N2_c14nTrim.xml

+<doc><clean></clean><dirty>A   B</dirty><mixed>A<clean></clean>B<dirty>A   B</dirty>C</mixed></doc>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inC14N3_c14nDefault.xml

+<doc>
+   <e1></e1>
+   <e2></e2>
+   <e3 id="elem3" name="elem3"></e3>
+   <e4 id="elem4" name="elem4"></e4>
+   <e5 xmlns="http://example.org" xmlns:a="http://www.w3.org" xmlns:b="http://www.ietf.org" attr="I'm" attr2="all" b:attr="sorted" a:attr="out"></e5>
+   <e6>
+      <e7 xmlns="http://www.ietf.org">
+         <e8 xmlns="">
+            <e9 attr="default"></e9>
+         </e8>
+      </e7>
+   </e6>
+</doc>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inC14N3_c14nPrefix.xml

+<n0:doc xmlns:n0="">
+   <n0:e1></n0:e1>
+   <n0:e2></n0:e2>
+   <n0:e3 id="elem3" name="elem3"></n0:e3>
+   <n0:e4 id="elem4" name="elem4"></n0:e4>
+   <n1:e5 xmlns:n1="http://example.org" xmlns:n2="http://www.ietf.org" xmlns:n3="http://www.w3.org" attr="I'm" attr2="all" n2:attr="sorted" n3:attr="out"></n1:e5>
+   <n0:e6>
+      <n2:e7 xmlns:n2="http://www.ietf.org">
+         <n0:e8>
+            <n0:e9 attr="default"></n0:e9>
+         </n0:e8>
+      </n2:e7>
+   </n0:e6>
+</n0:doc>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inC14N3_c14nTrim.xml

+<doc><e1></e1><e2></e2><e3 id="elem3" name="elem3"></e3><e4 id="elem4" name="elem4"></e4><e5 xmlns="http://example.org" xmlns:a="http://www.w3.org" xmlns:b="http://www.ietf.org" attr="I'm" attr2="all" b:attr="sorted" a:attr="out"></e5><e6><e7 xmlns="http://www.ietf.org"><e8 xmlns=""><e9 attr="default"></e9></e8></e7></e6></doc>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inC14N4_c14nDefault.xml

+<doc>
+   <text>First line&#xD;
+Second line</text>
+   <value>2</value>
+   <compute>value&gt;"0" &amp;&amp; value&lt;"10" ?"valid":"error"</compute>
+   <compute expr="value>&quot;0&quot; &amp;&amp; value&lt;&quot;10&quot; ?&quot;valid&quot;:&quot;error&quot;">valid</compute>
+   <norm attr=" '    &#xD;&#xA;&#x9;   ' "></norm>
+   <normNames attr="A &#xD;&#xA;&#x9; B"></normNames>
+   <normId id="' &#xD;&#xA;&#x9; '"></normId>
+</doc>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inC14N4_c14nTrim.xml

+<doc><text>First line&#xD;
+Second line</text><value>2</value><compute>value&gt;"0" &amp;&amp; value&lt;"10" ?"valid":"error"</compute><compute expr="value>&quot;0&quot; &amp;&amp; value&lt;&quot;10&quot; ?&quot;valid&quot;:&quot;error&quot;">valid</compute><norm attr=" '    &#xD;&#xA;&#x9;   ' "></norm><normNames attr="A &#xD;&#xA;&#x9; B"></normNames><normId id="' &#xD;&#xA;&#x9; '"></normId></doc>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inC14N5_c14nDefault.xml

+<doc attrExtEnt="entExt">
+   Hello, world!
+</doc>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inC14N5_c14nTrim.xml

+<doc attrExtEnt="entExt">Hello, world!</doc>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inC14N6_c14nDefault.xml

+<doc>©</doc>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsContent_c14nDefault.xml

+<a:foo xmlns:a="http://a">
+ <a:bar>xsd:string</a:bar>
+ <dsig2:IncludedXPath xmlns:dsig2="http://www.w3.org/2010/xmldsig2#">/soap-env:body/child::b:foo[@att1 != "c:val" and @att2 != 'xsd:string']</dsig2:IncludedXPath>
+</a:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsContent_c14nPrefixQnameXpathElem.xml

+<n0:foo xmlns:n0="http://a">
+ <n0:bar xmlns:n1="http://www.w3.org/2001/XMLSchema">n1:string</n0:bar>
+ <n4:IncludedXPath xmlns:n2="http://b" xmlns:n3="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:n4="http://www.w3.org/2010/xmldsig2#">/n3:body/child::n2:foo[@att1 != "c:val" and @att2 != 'xsd:string']</n4:IncludedXPath>
+</n0:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsContent_c14nQnameElem.xml

+<a:foo xmlns:a="http://a">
+ <a:bar xmlns:xsd="http://www.w3.org/2001/XMLSchema">xsd:string</a:bar>
+ <dsig2:IncludedXPath xmlns:dsig2="http://www.w3.org/2010/xmldsig2#">/soap-env:body/child::b:foo[@att1 != "c:val" and @att2 != 'xsd:string']</dsig2:IncludedXPath>
+</a:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsContent_c14nQnameXpathElem.xml

+<a:foo xmlns:a="http://a">
+ <a:bar xmlns:xsd="http://www.w3.org/2001/XMLSchema">xsd:string</a:bar>
+ <dsig2:IncludedXPath xmlns:b="http://b" xmlns:dsig2="http://www.w3.org/2010/xmldsig2#" xmlns:soap-env="http://schemas.xmlsoap.org/wsdl/soap/">/soap-env:body/child::b:foo[@att1 != "c:val" and @att2 != 'xsd:string']</dsig2:IncludedXPath>
+</a:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsDefault_c14nDefault.xml

+<foo>
+ <b:bar xmlns:b="http://b" att2="val" b:att1="val"></b:bar>
+</foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsDefault_c14nPrefix.xml

+<n0:foo xmlns:n0="">
+ <n1:bar xmlns:n1="http://b" att2="val" n1:att1="val"></n1:bar>
+</n0:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsPushdown_c14nDefault.xml

+<a:foo xmlns:a="http://a">
+ <b:bar xmlns:b="http://b"></b:bar>
+ <b:bar xmlns:b="http://b"></b:bar>
+ <b:bar xmlns:b="http://b"></b:bar>
+ <a:bar xmlns:b="http://b" b:att1="val"></a:bar>
+</a:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsPushdown_c14nPrefix.xml

+<n0:foo xmlns:n0="http://a">
+ <n1:bar xmlns:n1="http://b"></n1:bar>
+ <n1:bar xmlns:n1="http://b"></n1:bar>
+ <n1:bar xmlns:n1="http://b"></n1:bar>
+ <n0:bar xmlns:n1="http://b" n1:att1="val"></n0:bar>
+</n0:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsRedecl_c14nDefault.xml

+<foo xmlns:a="http://z3" xmlns:b="http://z2" b:att2="val2" a:att1="val1"> 
+ <bar xmlns="http://z0" xmlns:a="http://z2" xmlns:b="http://z3" a:att1="val1" b:att2="val2"></bar>
+</foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsRedecl_c14nPrefix.xml

+<n0:foo xmlns:n0="" xmlns:n1="http://z2" xmlns:n2="http://z3" n1:att2="val2" n2:att1="val1"> 
+ <n3:bar xmlns:n3="http://z0" n1:att1="val1" n2:att2="val2"></n3:bar>
+</n0:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsSort_c14nDefault.xml

+<a:foo xmlns:a="http://z3" xmlns:b="http://z2" xmlns:c="http://z1" c:att3="val3" b:att1="val1" b:att2="val2">
+ <c:bar></c:bar>
+ <c:bar xmlns:d="http://z0" d:att3="val3"></c:bar>
+</a:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsSort_c14nPrefix.xml

+<n2:foo xmlns:n0="http://z1" xmlns:n1="http://z2" xmlns:n2="http://z3" n0:att3="val3" n1:att1="val1" n1:att2="val2">
+ <n0:bar></n0:bar>
+ <n0:bar xmlns:n3="http://z0" n3:att3="val3"></n0:bar>
+</n2:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsSuperfluous_c14nDefault.xml

+<foo xmlns="http://z0" xmlns:a="http://z0" xmlns:b="http://z0" a:att1="val1" b:att2="val2"> 
+ <c:bar xmlns:c="http://z0" c:att3="val3"></c:bar>
+ <d:bar xmlns:d="http://z0"></d:bar>
+</foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsSuperfluous_c14nPrefix.xml

+<n0:foo xmlns:n0="http://z0" n0:att1="val1" n0:att2="val2"> 
+ <n0:bar n0:att3="val3"></n0:bar>
+ <n0:bar></n0:bar>
+</n0:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsXml_c14nDefault.xml

+<foo xmlns="http://z0" xml:id="23">
+  <bar xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xsd:string">data</bar>
+</foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsXml_c14nPrefix.xml

+<n0:foo xmlns:n0="http://z0" xml:id="23">
+  <n0:bar xmlns:n1="http://www.w3.org/2001/XMLSchema-instance" n1:type="xsd:string">data</n0:bar>
+</n0:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsXml_c14nPrefixQname.xml

+<n0:foo xmlns:n0="http://z0" xml:id="23">
+  <n0:bar xmlns:n1="http://www.w3.org/2001/XMLSchema" xmlns:n2="http://www.w3.org/2001/XMLSchema-instance" n2:type="n1:string">data</n0:bar>
+</n0:foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/out_inNsXml_c14nQname.xml

+<foo xmlns="http://z0" xml:id="23">
+  <bar xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xsd:string">data</bar>
+</foo>
\ No newline at end of file

Lib/test/xmltestdata/c14n-20/world.txt

+world
\ No newline at end of file

Misc/NEWS.d/next/Library/2019-04-26-10-10-34.bpo-13611.XEF4bg.rst

+The xml.etree.ElementTree packages gained support for C14N 2.0 serialisation.
+Patch by Stefan Behnel.