XML_SetCharacterDataHandler() 함수는 prototype에서 보이는 대로
XML_char *s, int len 두개의 변수를 이용한다.

즉, 이 함수를 통해 받아들여지는 내용을 출력하기 위해서는
printf("%s",s); 가 아닌

for (int i = 0; i < len; i++) printf("%c",s[i]);
로 한글자씩 len에 맞게 출력을 해주어야 한다.

XML_SetCharacterDataHandler(XML_Parser p, XML_CharacterDataHandler charhndl)

typedef void (*XML_CharacterDataHandler)(void *userData, const XML_Char *s, int len);

Set a text handler. The string your handler receives is NOT zero terminated. You have to use the length argument to deal with the end of the string. A single block of contiguous text free of markup may still result in a sequence of calls to this handler. In other words, if you're searching for a pattern in the text, it may be split across calls to this handler.

[링크 : http://www.xml.com/pub/a/1999/09/expat/index.html?page=3#chardatahandler]

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그리고, 위에 보이듯이, 줄단위로 받아들이므로
단순하게 한번 복사하는 걸로는 충분하지 않아 보인다.(어떻게 할지 모호하면.. realloc 해주어야 하나..)

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