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emergently easy xquerry and xpath with stylus

i need the xquery and xpath for the following:

1- titles of book ordered by " mark" ( customer)

2- sum ( total) price of books writen by " joe " ( author name) and sold on 24-07-2008

3- name of customers who ordered " sciences" ( categori name) books

u can find an attached copy of the XML file where these should be done

i need it as soon as possible

im not looking for minimum bids, i will pay full price as soon as the project is done by not more than 1 day

Færdigheder: XML

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Om arbejdsgiveren:
( 0 bedømmelser ) tripoli, Lebanon

Projekt-ID: #276360