Calling org.onap.cps.spi.CpsDataPersistenceService#getDataNodes with xpaths:

1. /parent-203/child-204[@key='A']
2. /parent-203/child-204[@key="A"]

results in data being returned for 1 but not for 2 (assuming appropriate data exists).
It appears to be caused by input xpaths not being normalized before querying database.