We use Generic XML to transform a MODS Pure OAI feed for Primo VE.  This entry links to various examples, including logic and functions, that have worked in the Pure/MODS/Generic XML environment. 
If you can suggest any improvements, it would be great to hear about them @ joan.kolarik@weizmann.ac.il

The normalization rule is PURE_MODS_XML. I have not saved it in the Normalization Rules > Community section because I feel that the information is more accessible as individual entries in the CKC. (If anyone requests it there, I'll be happy to add it)

Starts-With to Check for Text at Beginning of Field

Using Copy All to Create 3 Creators

Lower-Case 

Attribute Text as Condition

Element without Attribute as Condition, copied to Local Discovery Field

Concatenate to Build Source Field from Journal, Volume, Issue, Pages

Substring to Extract Month from Date Field

Use Contains Used in a Condition

Useful information sources

• community shares
• https://knowledge.exlibrisgroup.com/Primo/Product_Documentation/020Primo_VE/045Loading_Records_from_External_Sources_into_Primo_VE/Configuring_Normalization_Rules_for_Primo_VE
• https://docs.oracle.com/cd/E35413_01/doc.722/e35419/dev_xpath_functions.htm