Create a Studio File Type for processing TMX file

Hi,

I need to translated source en-US segment of a TMX file. 

I use the XPATH expression: //seg[contains(ancestor-or-self::*/@xml:lang,'EN-US')]  and associate it with "Always translatable" property.

But when I open the TMX file in Studio both source and target are extracted.... I do not understand why...

Any idea? Thanks

/François

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