"   AND xB.tagid=tag.tagid AND xB.mtime>xA.mtime",
    zTarget, wikiOverrideHash
  ) ){
    return 0;
  }
  return wikiOverrideHash;
}

/*
** If zTarget is an interwiki link, return a pointer to a URL for that
** link target in memory obtained from fossil_malloc().  If zTarget is
** not a valid interwiki link, return NULL.
**
** An interwiki link target is of the form:
**
**       Code:PageName
**
** "Code" is a brief code that describes the intended target wiki.
** Codes are assigned by "intermap:*" entries in the CONFIG table.
** The link is only valid if there exists an try in the CONFIG table
** that matches "intermap:Code".
**
** Each value of each intermap:Code entry in the CONFIG table is a JSON
** object with the following fields:
**
**    {
**      "base":  Base URL for the remote site.
**      "hash":  Append this to "base" for Hash targets.
**      "wiki":  Append this to "base" for Wiki targets.
**    }
**
** If the remote wiki is Fossil, then the correct value for "hash" 
** is "/info/" and the correct value for "wiki" is "/wiki?name=".
** If (for example) Wikipedia is the remote, then "hash" should be
** omitted and the correct value for "wiki" is "/wiki/".  
**
** PageName is link name of the target wiki.  Several different forms
** of PageName are recognized.
**
**    Path       If PageName is empty or begins with a "/" character, then
**               it is a pathname that is appended to "base".
**
**    Hash       If PageName is a hexadecimal string of 4 or more
**               characters, then PageName is appended to "hash" which
**               is then appended to "base".
**
**    Wiki       If PageName does not start with "/" and it is
**               not a hexadecimal string of 4 or more characters, then
**               PageName is appended to "wiki" and that combination is
**               appended to "base".
**
** See https://en.wikipedia.org/wiki/Interwiki_links for further information
** on interwiki links.
*/
static char *wiki_is_interwiki(const char *zTarget){
  int nCode;
  int i;
  const char *zPage;
  int nPage;
  char *zUrl = 0;
  Stmt q;
  for(i=0; zTarget[i] && zTarget[i]!=':'; i++){}
  if( zTarget[i]==0 ) return 0;
  nCode = i;
  if( nCode==4 && strncmp(zTarget,"wiki",4)==0 ) return 0;
  zPage = zTarget + nCode + 1;
  nPage = (int)strlen(zPage);
  db_prepare(&q, 
     "SELECT json_extract(value,'$.base'),"
           " json_extract(value,'$.hash'),"
           " json_extract(value,'$.wiki')"
     " FROM config WHERE name=lower('interwiki:%.*q')",
     nCode, zTarget);
  while( db_step(&q)==SQLITE_ROW ){
    const char *zBase = db_column_text(&q,0);
    if( zBase==0 || zBase[0]==0 ) break;
    if( nPage==0 || zPage[0]=='/' ){
      /* Path */
      zUrl = mprintf("%s%s", zBase, zPage);
    }else if( nPage>=4 && validate16(zPage,nPage) ){
      /* Hash */
      const char *zHash = db_column_text(&q,1);
      if( zHash && zHash[0] ){
        zUrl = mprintf("%s%s%s", zBase, zHash, zPage);
      }
    }else{
      /* Wiki */
      const char *zWiki = db_column_text(&q,2);
      if( zWiki && zWiki[0] ){
        zUrl = mprintf("%s%s%s", zBase, zWiki, zPage);
      }
    }
    break;
  }
  db_finalize(&q);
  return zUrl;
}

/*
** Resolve a hyperlink.  The zTarget argument is the content of the [...]
** in the wiki.  Append to the output string whatever text is appropriate
** for opening the hyperlink.  Write into zClose[0...nClose-1] text that will
** close the markup.
**

**
**    [0123456789abcdef]
**
**    [WikiPageName]
**    [wiki:WikiPageName]
**
**    [2010-02-27 07:13]
**
**    [InterMap:Link]  ->  Interwiki link
*/
void wiki_resolve_hyperlink(
  Blob *pOut,             /* Write the HTML output here */
  int mFlags,             /* Rendering option flags */
  const char *zTarget,    /* Hyperlink target; text within [...] */
  char *zClose,           /* Write hyperlink closing text here */
  int nClose,             /* Bytes available in zClose[] */
  const char *zOrig,      /* Complete document text */
  const char *zTitle      /* Title of the link */
){
  const char *zTerm = "</a>";
  const char *z;
  char *zExtra = 0;
  const char *zExtraNS = 0;
  char *zRemote = 0;

  if( zTitle ){
    zExtra = mprintf(" title='%h'", zTitle);
    zExtraNS = zExtra+1;
  }
  assert( nClose>=20 );
  if( strncmp(zTarget, "http:", 5)==0

      }
    }else if( g.perm.Hyperlink ){
      blob_appendf(pOut, "%z[",xhref(zExtraNS, "%R/info/%s", zTarget));
      zTerm = "]</a>";
    }else{
      zTerm = "";
    }
  }else if( (zRemote = wiki_is_interwiki(zTarget))!=0 ){
    blob_appendf(pOut, "<a href=\"%z\"%s>", zRemote, zExtra);
    zTerm = "</a>";
  }else if( (z = validWikiPageName(mFlags, zTarget))!=0 ){
    /* The link is to a valid wiki page name */
    const char *zOverride = wiki_is_overridden(zTarget);
    if( zOverride ){
      blob_appendf(pOut, "<a href=\"%R/info/%S\"%s>", zOverride, zExtra);
    }else{
      blob_appendf(pOut, "<a href=\"%R/wiki?name=%T\"%s>", z, zExtra);