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-rw-r--r--Master/texmf-dist/doc/fonts/xcharter/xcharter-doc.tex15
1 files changed, 14 insertions, 1 deletions
diff --git a/Master/texmf-dist/doc/fonts/xcharter/xcharter-doc.tex b/Master/texmf-dist/doc/fonts/xcharter/xcharter-doc.tex
index 23aebcc9030..415576ce969 100644
--- a/Master/texmf-dist/doc/fonts/xcharter/xcharter-doc.tex
+++ b/Master/texmf-dist/doc/fonts/xcharter/xcharter-doc.tex
@@ -178,7 +178,20 @@ Because the package supplies a file named {\tt XCharter.fontspec} whose contents
\usepackage{fontspec}
\setmainfont{XCharter}
\end{verbatim}
-With unicode-encoded text, you will, in particular, have complete access to the newly added Cyrillic glyphs.
+With unicode-encoded text, you will, in particular, have complete access to the Cyrillic glyphs.
+
+\section{XCharter and PDF/A}
+There are a number of PDF/A validators available, though their outputs can and do differ when applied to the same document. I've tried the following.
+\begin{itemize}
+\item
+Adobe Acrobat Pro. Almost all XCharter documents validate PDF/A-1b.
+\item
+\url{https://www.pdf-online.com/osa/validate.aspx} is a free online validator. Almost all XCharter documents validate PDF/A-1b.
+\item
+The free {\tt veraPDF} validator is much stricter. Most documents produced using XCharter failed.
+\end{itemize}
+\newpage
+
\section{Using Cyrillic with pdflatex}
The OT$2$ encoding, now considered as obsolete because it is 7-bit, is nonetheless useful to scholars who wish to write short segments using a Cyrillic script from a Western keyboard. There are two means of doing this, one using control sequences for the characters (e.g., \verb|\CYRA| for Cyrillic A) and the other using ligatures to access the characters. Tables setting out the substitutions available may be consulted at \url{http://herbert.the-little-red-haired-girl.org/dvi/pdf/cyrillic.pdf}.