How to change apache fop encoding from configuration? (Default is İdentity -h)

I need to change apache fop encoding but i can't find any solution for this.
Now in my application encoding of fop generated pdf file is - Identity -h.
That's why i can't extract pdf file, can't copy from pdf and paste to
another textbox and etc.
Note: These are my fonts in fop config file: 
 <font-triplet name="Arial" style="normal" weight="normal"/>   <font-triplet
name="Arial" style="normal" weight="bold"/>   <font-triplet name="Arial"
style="italic" weight="normal"/>   <font-triplet name="Arial" style="italic"
weight="bold"/> 
If needs i can post more information about problem.



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