B5f: link references with attributes fails

[e-picas]

The attributes add to a link reference failes when they are on the same line but works if they are on a second line. In the first case, the reference is not even understood as a link.

This DOES NOT work:

[dolor sit amet3]: http://aboutmde.org/loremipsum/lorem-ipsum.html "Consectetur adipiscing" attribute1=value attribute2="value1 value2"

While this works:

[dolor sit amet3]: http://aboutmde.org/loremipsum/lorem-ipsum.html "Consectetur adipiscing" 
    attribute1=value attribute2="value1 value2"

[e-picas]

This also fails for Images references (B6b).