ResolveRelativeURI

function ResolveRelativeURI(

  const BaseUri: UnicodeString;

  const RelUri: UnicodeString;

  out ResultUri: UnicodeString

):Boolean; overload;

function ResolveRelativeURI(

  const BaseUri: AnsiString;

  const RelUri: AnsiString;

  out ResultUri: AnsiString

):Boolean; overload;