From 2fbe90e86d3e8d7e38228e705aaef8397e3d7207 Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Tue, 8 Apr 2025 11:33:05 +0200
Subject: process default namespace

---
 .../semantic-markdown/semantic-markdown.lua        | 28 ++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

(limited to '_extensions/ruc-play/semantic-markdown/semantic-markdown.lua')

diff --git a/_extensions/ruc-play/semantic-markdown/semantic-markdown.lua b/_extensions/ruc-play/semantic-markdown/semantic-markdown.lua
index 70f4970..92d9fa7 100644
--- a/_extensions/ruc-play/semantic-markdown/semantic-markdown.lua
+++ b/_extensions/ruc-play/semantic-markdown/semantic-markdown.lua
@@ -108,15 +108,35 @@ local curie_default = ":"
 --- @see <https://pandoc.org/lua-filters.html#type-blocks>
 --- @see <https://www.w3.org/TR/rdf12-concepts/#vocabularies>
 local function Namespaces(blocks)
+
+  -- paragraph with only a braced reference CURIE, colon and one word
   if #blocks.content == 3
     and blocks.content[1].t == "Str"
     and blocks.content[2].t == "Space"
-    and blocks.content[3].t == "Str"
     and blocks.content[1].text:match "^{"..curie_no_ref.."}%:%:$"
-    and blocks.content[3].text:match "^https?:"
   then
-    -- FIXME: register namespace in Meta
-    return pandoc.Blocks {}
+
+    -- default namespace, misparsed as a citation
+    if blocks.content[3].t == "Cite"
+        and #blocks.content[3].content == 1
+
+        -- TODO: maybe check case-insensitively
+        and blocks.content[3].content[1].text == "@default"
+    then
+      -- FIXME: add CURIE to metadata
+      return {}
+    end
+
+    -- namespace
+    if blocks.content[3].t == "Str"
+
+        -- TODO: maybe check case-insensitively
+        -- TODO: relax to match URI syntax without hardcoded protocols
+      and blocks.content[3].text:match "^https?:"
+    then
+      -- FIXME: add CURIE and URI to metadata
+      return {}
+    end
   end
 end
 
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