<?xml version="1.0" encoding="UTF-8" ?> <routes xmlns="http://symfony.com/schema/routing" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://symfony.com/schema/routing https://symfony.com/schema/routing/routing-1.0.xsd"> <when env="some-env"> <route id="a" path="/a2" /> <route id="b" path="/b" /> </when> <when env="some-other-env"> <route id="a" path="/a3" /> <route id="c" path="/c" /> </when> <route id="a" path="/a1" /> </routes>