Fifa-ng-db-meta.xml -

<table name="players">
    <field name="playerid" data_type="INTEGER" length="4" nullable="false" primary_key="true"/>
    <field name="overallrating" data_type="INTEGER" length="1" min="0" max="99"/>
    <field name="potential" data_type="INTEGER" length="1" min="0" max="99"/>
    <field name="preferredfoot" data_type="INTEGER" length="1" enum="0=Right,1=Left"/>
    <foreign_key field="teamid" reference_table="teams" reference_field="teamid"/>
</table>

It lists every valid table in the database (e.g., players, teams, leagues, balls) and specifies exactly what fields exist in them. This allows you to:

If you are attempting to mod FIFA and encounter a crash, the fifa-ng-db-meta.xml is often the culprit. Here are the most frequent issues: fifa-ng-db-meta.xml