Add .nodePath() example to docs/tests

Author: dwarring

docs/Node.md

@@ -146,7 +146,15 @@ The returned key value is useful as a key in hashes.
 
     method nodePath() returns Str
 
-This function is not specified for any DOM level: It returns a canonical structure based XPath for a given node.
+This function is not specified for any DOM level: It returns a canonical structure based XPath for a given node. For example:
+
+```raku
+use LibXML::Document;
+use LibXML::Element;
+LibXML::Document:D $doc .= parse: :file<samples/dromeds.xml>;
+my LibXML::Element @humps = $doc.find: "//humps";
+say @humps[0].nodePath: # /dromedaries/species[1]/humps
+```
 
 ### method isBlank
 

lib/LibXML/Node.rakumod

@@ -217,7 +217,15 @@ constant names, namely: `#text`, `#cdata-section`, `#comment`, `#document`,
         method nodePath() returns Str
 
     This function is not specified for any DOM level: It returns a canonical
-    structure based XPath for a given node.
+    structure based XPath for a given node. For example:
+
+    =begin code :lang<raku>
+    use LibXML::Document;
+    use LibXML::Element;
+    LibXML::Document:D $doc .= parse: :file<samples/dromeds.xml>;
+    my LibXML::Element @humps = $doc.find: "//humps";
+    say @humps[0].nodePath: # /dromedaries/species[1]/humps
+    =end code
 
     =head3 method isBlank
 

lib/LibXML/SAX/Handler/XML.rakumod

@@ -1,8 +1,8 @@
-use LibXML::SAX::Handler::SAX2;
-
 #| Build pure Raku XML documents using LibXML's SAX parser
-class LibXML::SAX::Handler::XML
-    is LibXML::SAX::Handler::SAX2 {
+class LibXML::SAX::Handler::XML {
+
+    use LibXML::SAX::Handler::SAX2;
+    also is LibXML::SAX::Handler::SAX2;
 
     # This class Builds a Raku 'XML' document,
 

t/08findnodes.t

@@ -39,6 +39,8 @@ subtest 'findnodes basic', {
 
     @slist = $node.findnodes('./humps');
     is +@slist, 1, 'self path on relative name';
+    is @slist[0].nodePath, '/dromedaries/species[1]/humps';
+    is @slist[0]<text()>[0].nodePath, '/dromedaries/species[1]/humps/text()';
 
     # find a single node
     @list   = $elem.findnodes( "species[\@name='Llama']" );