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Docs: address review comments from Jose.

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Mike Hearn 2018-12-20 16:44:15 +01:00
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10
docs/source/app-upgrade-notes.rst
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@ -78,16 +78,18 @@ a good idea because some features and improvements are only available to apps th
The minimum platform version is just the (major) version number of the node that you require, so if you
start using new APIs and features in Corda 4, you should set this to 4. Unfortunately Corda 3 and below
do not know about this metadata and don't check it, so your app will still be loaded in such nodes and
then crash at runtime. However it's good to get in the habit of setting this properly for future releases.
may exhibit undefined behaviour at runtime. However it's good to get in the habit of setting this
properly for future releases.
The new ``versionId`` number is a version code for **your** app, and is unrelated to Corda's own versions.
It is used to block state downgrades: when a state constraint can be satisfied
by multiple attachments, the version is tracked in the ledger and cannot decrement. This ensures security
fixes in CorDapps stick and can't be reversed by downgrading states to an earlier version. See
":ref:`contract_non-downgrade_rule_ref`" for more information. In future, the version attached to the
workflow JAR will also be used to help implement smoother upgrade and migration features. If the "normal"
version number of your app as defined in your Gradle file follows the convention of always being a whole
number starting from 1, you can just refer to that variable directly to set the version id.
workflow JAR will also be used to help implement smoother upgrade and migration features. You may directly
reference the gradle version number of your app when setting the cordapp specific versionId identifiers
if this follows the convention of always being a whole number starting from 1, you can just refer to that
variable directly to set the version id.
The duplication between ``contract`` and ``workflow`` blocks exists because you should split your app into
two separate JARs/modules, one that contains on-ledger validation code like states and contracts, and one