Hello, 
I'm trying to Xpath match the Links in the Stock Forecast view. 

They are defined like so: 
Okay this editor doesnt like to print xml content... you can refer to: 

https://github.com/odoo/odoo/blob/e887055f01fa1d726f4aaf10fd954b2a132ed018/addons/stock/report/report_stock_forecasted.xml#L135-L139


I woult like to match the "a" Tag. 
I already tried escaping the Expression, but no such luck so far:
expr="//a[@t-if='line[\'document_out\']']" 
expr="//a[@t-if='line['document_out']']"

Does anyone know, how to escape the Square breackets and the single quotes?