That's a good idea. If you need help with the errors, feel free to post the modmod and hopefully someone can take a look at it.
I am not getting what i want however. The code for zAnimals_CIV4BuildingInfos.xml is:
<TechCommerceChanges>
<PrereqTech>TECH_WRITING</PrereqTech>
<TechCommerceChange>
<TechCommerce>
<iCommerce>0</iCommerce>
<iCommerce>0</iCommerce>
<iCommerce>1</iCommerce>
</TechCommerce>
</TechCommerceChange>
<TechCommerceChange>
<PrereqTech>TECH_BIOLOGY</PrereqTech>
<TechCommerce>
<iCommerce>0</iCommerce>
<iCommerce>-1</iCommerce>
<iCommerce>0</iCommerce>
</TechCommerce>
</TechCommerceChange>
</TechCommerceChanges>
The code for Animal_Myth_CIV4BuildingInfos.xml in DH is:
TechCommerceChanges>
<TechCommerceChange>
<PrereqTech>TECH_WRITING</PrereqTech>
<TechCommerce>
<iCommerce>0</iCommerce>
<iCommerce>0</iCommerce>
<iCommerce>1</iCommerce>
</TechCommerce>
</TechCommerceChange>
<TechCommerceChange>
<PrereqTech>TECH_BIOLOGY</PrereqTech>
<TechCommerce>
<iCommerce>0</iCommerce>
<iCommerce>-1</iCommerce>
<iCommerce>0</iCommerce>
</TechCommerce>
</TechCommerceChange>
</TechCommerceChanges>
What im getting is that it says -1

with Biology, but not +1

with Writing. It does not spit errors at me, but Im not getting the result I want. Im not done either, it still gotta do <ObsoleteTech>TECH_COMPULSORY_EDUCATION</ObsoleteTech> with the myths, and I want the earth, and metal myths to have -1

with Geology, not to mention the myths of volcanoes, stone from the sky, etc to have -1

with their respective techs.