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To understand the casexml spec, see https://bitbucketgithub.orgcom/javarosadimagi/javarosacommcare-core/wiki/casexmlcasexml20; to understand the fixtures spec, see https://bitbucketgithub.orgcom/commcaredimagi/commcare-core/wiki/fixtures.
When the phone receives the case blocks, for example, it applies them all in order to its internal database, thus reconstructing the case list.
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