Anything with LOC_ is going to just be a text value. You could just put "Likes civs who has high science, doesn't like civs who ignore science." The description argument is usually something you see in game. Not sure what statement key is. Hidden agenda probably refers to the agenda not being visible until a higher diplomatic level. Negative # would be a negative Diplo value, yes.
From a glance, assuming all those requirement sets are vanilla and already defined (which they look like they are) the code looks good. I would reorganize though. You should put all 3 modifiers in one modiifer tag like: (the names are fine how they are)
Code:
<Modifiers>
<Row>
<ModifierId>Mod_1</ModifierId>
<ModifierType>Type</ModifierType>
<SubjectRequirementSetId>SRSI</SubjectRequirementSetId>
</Row>
<Row>
<ModifierId>Mod_2</ModifierId>
<ModifierType>Type</ModifierType>
<SubjectRequirementSetId>SRSI</SubjectRequirementSetId>
</Row>
<Row>
<ModifierId>Mod_3</ModifierId>
<ModifierType>Type</ModifierType>
<SubjectRequirementSetId>SRSI</SubjectRequirementSetId>
</Row>
</Modifiers>
Same thing for the modifier arguments and any other time you add multiple things to the same database table.