继续我们这一块的工作。
pan:pan是一个数据引擎，从不同的数据源读取，转换和写入数据。
kitchen：是一个程序，用来执行job。
Transformations and Jobs可以听过xml文件或者数据库里的信息来描述自身的行为。
下表列出转换中的一些定义：
| Transformation | Description |
|---|---|
| Value | Values are part of a row and can contain any type of data: strings, floating point numbers, unlimited precision BigNumbers, integers, dates or boolean values |
| Row | A row consists of 0 or more values that are processed together as a single entry. |
| Input Stream | A stack of rows that enters a step |
| Hop | A graphical representation of one or more data streams between two steps; a hop always represents the output stream for one step and the input stream for another — the number of streams is equal to the copies of the destination step (one or more) |
| Note | Descriptive text that can be added to a transformation |
job的一些定义：
| Job | Description |
|---|---|
| Job Entry | A part of a job that performs a specific task |
| Hop | A graphical representation of one or more data streams between two steps; a hop always represents the output stream for one step and the input stream for another — the number of streams is equal to the copies of the destination step (one or more) |
| Note | Descriptive text that that can be added to a job |