parser: Deprecate xmlIsLetter

include/libxml/parserInternals.h

@@ -296,9 +296,7 @@ XMLPUBVAR const xmlChar xmlStringText[];
 XMLPUBVAR const xmlChar xmlStringTextNoenc[];
 XMLPUBVAR const xmlChar xmlStringComment[];
 
-/*
- * Function to finish the work of the macros where needed.
- */
+XML_DEPRECATED
 XMLPUBFUN int                   xmlIsLetter     (int c);
 
 /**

parserInternals.c

@@ -422,6 +422,8 @@ xmlFatalErr(xmlParserCtxtPtr ctxt, xmlParserErrors code, const char *info)
  * xmlIsLetter:
  * @c:  an unicode character (int)
  *
+ * DEPRECATED: Internal function, don't use.
+ *
  * Check whether the character is allowed by the production
  * [84] Letter ::= BaseChar | Ideographic
  *

python/generator.py

@@ -312,6 +312,7 @@ deprecated_funcs = {
     'xmlInitializeDict': True,
     'xmlIOFTPMatch': True,
     'xmlIOHTTPMatch': True,
+    'xmlIsLetter': True,
     'xmlIsRef': True,
     'xmlKeepBlanksDefault': True,
     'xmlLineNumbersDefault': True,