how the document’s category, title, author, etc are read? In other words, during view the document using “document view”, the category is the same as the document column. So, according to what determine the category, author, etc?
Another note, the text is repeated for title and body. why?
Hi @ahmed_gomaa -
Usually, these fields are set using the String to Document node. Did you use one earlier in your workflow?
Yes, I did. I used it in the beginning of the workflow directly after reading data from the DB.
In that case, I would carefully check the settings of that node to see if the category, author, and other meta information were originally assigned as you intended.
There are several workflow examples on the Hub using the String to Document node if you need additional clarification. 
According to your screenshots, you’re pulling the meta-info (source, category, author) all from the same field as the text. If you don’t actually have meta-info, you can just untick the boxes and those variables won’t be assigned.
In this example workflow, you can see the meta-info being assigned in the Strings to Document node, based on fields in the original text file. Let me know if you have more questions.
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