In the past , lexicon standardization has been studied .
In the past , lexicon standardization has been developed by a series of projects like GENELEX , EDR , EAGLES , MULTEXT , PAROLE , SIMPLE and ISLE .
In the past , lexicon standardization has been studied and developed by a series of projects like GENELEX , EDR , EAGLES , MULTEXT , PAROLE , SIMPLE and ISLE .