中国公司发派遣函到德国商务考察的签证是怎样的内容?

内容应包括一下几项：

人员信息
停留时间
考察内容，也就是目的
考察费用承担的问题
如期返回的问题
等

这是我一般出的样本：
To whom
may be conced

Here we are warmly welcome Mr. XXX of XXX company to visit us during xxx to xxx. We will discuss the cooperation and business development in China. All of his expenses including hotel, food and transport will be taken by our company. The detail personal information and schedule are as following:
Personal Data
Schedule

If you have any question, please feel free to let us know.