tweak Span tag/--omit option handling

Makefile

@@ -1,14 +1,15 @@
 DocProj=pdf-raku.github.io
 DocRepo=https://github.com/pdf-raku/$(DocProj)
 DocLinker=../$(DocProj)/etc/resolve-links.raku
+TEST_JOBS ?= 6
 
 all : doc
 
 test :
-	@prove -e"raku -I ." t
+	@prove6 -I . -j $(TEST_JOBS) t
 
 loudtest :
-	@prove -e"raku -I ." -v t
+	@prove6 -I . -v t
 
 clean :
 	@rm -f docs/Tags.md docs/Tags/*.md docs/Tags/*/*.md

lib/PDF/Tags/Node/Parent.rakumod

@@ -265,7 +265,7 @@ Returns an XPath expression to locate the node in the document tree.
 Returns a Hash of child nodes (arrays of lists) and attributes (prefixed by '@')
 
    say $tags.first('Document/L[1]').Hash<LBody>[0].text;  # text of first list-item
-   say $tags.first('Document/L[1]').Hash<@ListNumbering>; # lit numbering attribute
+   say $tags.first('Document/L[1]').Hash<@ListNumbering>; # list numbering attribute
 
 =head3 Alias methods
 
@@ -289,17 +289,16 @@ List(L), ListItem(LI), Label(Lbl), ListBody(LBody),
 
 =head4 Table Tags
 
-Table,  TableRow(TR),     TableHeader(TH),
+Table, TableRow(TR), TableHeader(TH),
 TableData(TD), TableBody(TBody), TableFooter(TFoot),
 
 =head4 Inline Element Tags
 
 Span, Quotation(Quote), Note, Reference,
 BibliographyEntry(BibEntry), Code, Link,
-Annotation(Annot),
+Annotation(Annot), Artifact,
 Ruby, RubyPunctutation(RP), RubyBaseText(RB), RubyText(RT),
 Warichu, WarichuPunctutation(RP), WarichuText(RT),
-Artifact,
 
 =head4 Illustration Tags
 

lib/PDF/Tags/XML-Writer.rakumod

@@ -223,7 +223,7 @@ multi method stream-xml(PDF::Tags::Elem $node, UInt :$depth is copy = 0) {
             %attributes<href> = $_ with find-href($node);
         }
         atts-str(%attributes);
-    }
+    } // '';
     $name = $_ with $role;
     my $omit-tag = $name ~~ $_ with $!omit;
 
@@ -314,7 +314,7 @@ method !marked-content(PDF::Tags::Mark $node, :$depth!) {
     my $omit-tag = ! $!marks;
     $omit-tag ||= $name ~~ $_ with $!omit;
     if $omit-tag {
-        if $!atts && $omit-tag !~~ 'Span' {
+        if $!atts && !($!omit ~~ 'Span') {
             # try to retain content-level language tags
             my $Lang := .<Lang>
                 with $node.attributes;