Extracting Metadata from the Input File
Metadata is data describing the data structure.
You can extract metadata from your flat data file or create it by your own. We will show you, how to extract it from input file.
Right-click the first edge and select→ .
Figure 1.15. Extracting Metadata
A wizard for metadata extraction opens. Usebutton to open dialog to specify a file.
Figure 1.16. Introductory Window of Metadata Editor
input.dat file in
data-in directory and click the button.
Figure 1.17. Selecting Data File
The Metadata Editor fills up:
Figure 1.18. Metadata Editor (Introductory Pane Filled)
Click Next to specify metadata fields.
Figure 1.19. Metadata Editor (Editing Pane)
As you can see, the wizard guessed that the records consisted of three fields and it also understood that the third field values were integer numbers.
You can replace the three default field names
Field3) with more descriptive ones:
To do that, click the
Field1 item and enter the new field name.
Figure 1.20. Renaming a Field
Do the same with the other two field names. The result will look like this:
Figure 1.21. All Fields Have Been Renamed
Now click. This way you have created metadata. The metadata has been assigned to the edge.
You can extract metadata on edges and on input components.