Best way to create a library of PL/SQL to be used by many schemas

I looking for the best way to build a library of PL/SQL packages that can be used from multiple schemas in my DB. The way we use our DB is that we create a new schema for each client and then create tables, import data and do a bunch of validation. So I'm trying to build a library of code that will automate some of this.
The way I've gone about it so far is to create a "master" schema to house the code which I then invoke while passing the name of the schema I want it to operate on. The problem is that the master schema must have permission to create/alter/drop tables in the other schema. In my environment I have to go through a lengthy request process to get permission granted.
So I'm wondering if there's a better way of creating a centralized library of PL/SQL that can be invoked from multiple schemas in such a way that it acts upon the tables contained in the invoking schema?

That's a good point, Justin - thanks for the advice. At the moment, our process of data validation isn't very well defined, so the table definitions aren't always the same beyond a core set. As we get more automated and able to develop table definitions flexible enough to accomodate all the quirks in client data, I may be able to consider moving to a single schema to take advantage of maintenance and performance improvements. My ultimate concern with doing that is that the datasets we're dealing with can be tens of millions of rows in size. Clearly, I'm no DBA, but I just assumed that we would be able to churn through these datasets faster if they were in a schema by themselves rather than lumped together into one huge half-a-billion row table?

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[link1|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/a00c07d0-61e0-2a10-d589-d7bc9894b02a]
[link2|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/10b99341-60e0-2a10-6e80-b6e9f58e3654]
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Thanks for the replies. I reviewed them shortly after they were submitted but I'm also working on other projects at the same time (hence the delayed reply).
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Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support,
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Best way to create a library of PL/SQL to be used by many schemas

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