typedef struct Xelem Xelem;typedef struct Xattr Xattr; struct Xelem{	char  *n;	char  *v;	Xattr *a;	Xelem *ch;	Xelem *next;	void  *priv;}; struct Xattr{	char  *n;	char  *v;	Xattr *next;}; enum{	Xmlstartonly = 1,}; typedef struct Biobuf Biobuf; Xelem *xmlread(Biobuf *b, int flags, int *err);void xmlfree(Xelem *xml);void xmlprint(Xelem *x, int fd);Xelem *xmlget(Xelem *x, char *n);Xattr *xmlgetattr(Xattr *a, char *n); #pragma varargck type "Ӽ" char*int xmlstrfmt(Fmt *f);