xml: markup language attributes take a bcp 47 tag

Spine names a language as the directory under media/text/ is
named, which for a region is the posix form with an underscore,
pt_BR. A lang, xml:lang or dc:language value is a BCP 47 (RFC
3066) tag and wants a hyphen, pt-BR. Spine put its own code
there unchanged, so a document in a region language produced an
invalid attribute in every one of its xhtml files: 138 epubcheck
errors for a document of ten segments and a navigation file.

src.language_tag is the same language as a tag. The attributes
and the dc metadata now read it. Output paths keep src.language,
since a path is named after the directory, not after the tag.

(assisted by Claude-Code)

2 files changed, 10 insertions, 10 deletions

diff --git a/src/sisudoc/outputs/io_out/epub3.d b/src/sisudoc/outputs/io_out/epub3.d
index 8a3baaf..c785895 100644
--- a/src/sisudoc/outputs/io_out/epub3.d
+++ b/src/sisudoc/outputs/io_out/epub3.d
@@ -298,7 +298,7 @@ template outputEPub3() {
       <item id="css" href="%s" media-type="text/css"/>
       <item id="nav" href="toc_nav.xhtml" media-type="application/xhtml+xml" properties="nav" />
   ┃",
-      doc.matters.src.language,
+      doc.matters.src.language_tag,
       _uuid,
       xhtml_format.special_characters_plain(doc.matters.conf_make_meta.meta.title_main),
       (doc.matters.conf_make_meta.meta.title_sub.empty) ? "" : format(
@@ -309,7 +309,7 @@ template outputEPub3() {
         ? "" : xhtml_format.special_characters_plain(doc.matters.conf_make_meta.meta.creator_author),
       (doc.matters.conf_make_meta.meta.creator_author_surname_fn.empty)
         ? "" : xhtml_format.special_characters_plain(doc.matters.conf_make_meta.meta.creator_author_surname_fn),
-      doc.matters.src.language,                                   // language, fix (needed in dochead metadata)
+      doc.matters.src.language_tag,                                   // language, fix (needed in dochead metadata)
       (doc.matters.conf_make_meta.meta.date_published.empty)
         ? "" : xhtml_format.special_characters_plain_date(doc.matters.conf_make_meta.meta.date_published),
       (doc.matters.conf_make_meta.meta.rights_copyright.empty)
diff --git a/src/sisudoc/outputs/io_out/xmls.d b/src/sisudoc/outputs/io_out/xmls.d
index 4ce5434..c97a7e3 100644
--- a/src/sisudoc/outputs/io_out/xmls.d
+++ b/src/sisudoc/outputs/io_out/xmls.d
@@ -308,7 +308,7 @@ template outputXHTMLs() {
         special_characters_plain(doc_matters.conf_make_meta.meta.date_available),
         special_characters_plain(doc_matters.conf_make_meta.meta.date_valid),
         special_characters_plain(doc_matters.conf_make_meta.meta.date_modified),
-        doc_matters.src.language,
+        doc_matters.src.language_tag,
         special_characters_plain(doc_matters.conf_make_meta.meta.rights_copyright),
         doc_matters.opt.action.generated_by ? special_characters_plain(doc_matters.generator_program.name_and_version) : "",
         special_characters_plain(doc_matters.generator_program.url_home),
@@ -473,7 +473,7 @@ template outputXHTMLs() {
         ((type == "seg")
           ? "../../../css/html_seg.css"
           : "../../css/html_scroll.css"),
-        doc_matters.src.language,
+        doc_matters.src.language_tag,
         site_info_button(doc_matters),
         metadata_links,
         inline_search_form(doc_matters),
@@ -491,16 +491,16 @@ template outputXHTMLs() {
       xmlns="http://www.w3.org/1999/xhtml"
       xmlns:epub="http://www.idpf.org/2007/ops"
       lang="%s" xml:lang="%s">┃",
-        doc_matters.src.language,
-        doc_matters.src.language,
+        doc_matters.src.language_tag,
+        doc_matters.src.language_tag,
       );
       string html_strict = format(q"┃<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
          "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
     <html xmlns="http://www.w3.org/1999/xhtml"
       xmlns:epub="http://www.idpf.org/2007/ops"
       lang="%s" xml:lang="%s">┃",
-        doc_matters.src.language,
-        doc_matters.src.language,
+        doc_matters.src.language_tag,
+        doc_matters.src.language_tag,
       );
       string o;
       o = format(q"┃%s
@@ -540,11 +540,11 @@ template outputXHTMLs() {
         special_characters_plain(doc_matters.conf_make_meta.meta.date_available),
         special_characters_plain(doc_matters.conf_make_meta.meta.date_valid),
         special_characters_plain(doc_matters.conf_make_meta.meta.date_modified),
-        doc_matters.src.language,
+        doc_matters.src.language_tag,
         special_characters_plain(doc_matters.conf_make_meta.meta.rights_copyright),
         special_characters_plain(doc_matters.generator_program.name_and_version),
         special_characters_plain(doc_matters.generator_program.url_home),
-        doc_matters.src.language,
+        doc_matters.src.language_tag,
       );
       return o;
     }