Cleanup: Standardize validation messages

Description

(Imported from Google Code)
Issue #208 cleaned up the validation text in every class' header javadoc. Need to update the class-thrown errors as well.

e.g. "attribute is required" vs. "attribute must exist".

  • Standardize wording to match the rules in the header comment.

  • Standarize how fields are mentioned "createDate" vs "creation date" vs "ism:createDate".

Assignee

Brian Uri

Reporter

Brian Uri

Labels

None

Fix versions

Priority

Medium
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