Problem with parsing list's key statement argument where nodes are separted by new line character, like in this example [1]:

list gen-test-session-allocation {

   key "entity-name
        test-instance-name
        untagged
        pcp
        color";

Error message:

Caused by: org.opendaylight.yangtools.yang.parser.spi.source.SourceException: Invalid identifier 'entity-name
test-instance-name
untagged
pcp
color' [at vendor/ciena/ciena-sat.yang:1854:6]

By YANG ABNF Grammar [2]:

key-arg = node-identifier *(sep node-identifier)
sep = 1*(WSP / line-break)

By RFC6020 list's key Statement documentation [3]:

The "key" statement, which MUST be present if the list represents
configuration, and MAY be present otherwise, takes as an argument a
string that specifies a space-separated list of leaf identifiers of
this list.

[1] - https://github.com/YangModels/yang/blob/master/vendor/ciena/ciena-sat.yang#L1854

[2] - https://tools.ietf.org/html/rfc6020#section-12

[3] - https://tools.ietf.org/html/rfc6020#section-7.8.2