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+```
+% pandoc -f biblatex -t markdown -s
+@comment{
+    - bibtex and biblatex
+        - expect titles in title case
+        - styles use titles as is, or convert them to sentence case
+        - strings wrapped {} are not converted
+    - all CSL styles at <http://github.com/citation-style-language/styles>
+      and <https://www.zotero.org/styles/>
+        - expect titles in sentence case
+        - styles use titles as is, or convert them to title case
+        - except for (hardcoded) list of stop words, see
+          <http://citationstyles.org/downloads/specification.html#title-case-conversion>
+        - citeproc-js (MLZ only?) also recognizes a markup syntax for
+          suppressing title-case changes on a range of text (see
+          <https://forums.zotero.org/discussion/21991/excessive-capitalization-of-citation-titles/#Item_22>):
+            - `<span class="nocase"/>lowercase</span>`
+    - Proposal:
+        - When converting to yaml, convert English titles to sentence case,
+            - for all strings wrapped in {} where {} is not part of a latex
+              command, ...
+            - ... when starting with an uppercase letter: suppress
+conversion, remove the {}
+            - ... when starting with a lowercase letter ("nm", "iPod"):
+              suppress conversion, replace the {} with
+              <span class="nocase"/></span>
+            - Note: Camel case ("iPod") needs to be protected in
+              bibtex/biblatex anyway; the only "extension" (wrt bibtex/biblatex
+              specs) we'd be introducing is wrapping lowercase-only strings in
+              {}, something that is never necessary on the latex side but
+              won't break anything there either.
+        - citeproc-hs/pandoc-citeproc should be modified to honour this new
+          syntax and suppress conversion to title case for strings wrapped
+          in `<span class="nocase"/></span>`.
+        - Expected output, using one of the title-case CSL styles, here
+          chicago-author-date.csl:
+
+            Author, Ann. 2013. “A Title, in English, with a Proper Name and
+an
+            ACRONYM and a camelCase Word and Some Units, 400 nm, 3 cm, and
+a Quote,
+            *Alea iacta est*.” *Journal*.
+    }
+
+@article{item1,
+    Author = {Author, Ann},
+    Date = {2013},
+    Hyphenation = {english},
+    Journaltitle = {Journal},
+    Title = {A Title, in {English}, with a {Proper Name} and an {ACRONYM}
+and a {camelCase} Word and Some Units, 400~{nm}, 3~{cm}, and a Quote,
+\textit{{Alea} {iacta est}}}
+}
+
+^D
+---
+nocite: '[@*]'
+references:
+- author:
+  - family: Author
+    given: Ann
+  container-title: Journal
+  id: item1
+  issued: 2013
+  language: 'en-US'
+  title: 'A title, in English, with a Proper Name and an ACRONYM and a
+    [camelCase]{.nocase} word and some units, 400 [nm]{.nocase},
+    3 [cm]{.nocase}, and a quote, *Alea [iacta est]{.nocase}*'
+  type: 'article-journal'
+---
+
+
+```