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 # Schema Reference
 
 Pacemaker's XML schema has a version of its own, independent of the version of
 Pacemaker itself.
 
 ## Versioned Schema Evolution
 
 A versioned schema offers transparent backward and forward compatibility.
 
 - It reflects the timeline of schema-backed features (introduction,
   changes to the syntax, possibly deprecation) through the versioned
   stable schema increments, while keeping schema versions used by default
   by older Pacemaker versions untouched.
 
 - Pacemaker internally uses the latest stable schema version, and relies on
   supplemental transformations to promote cluster configurations based on
   older, incompatible schema versions into the desired form.
 
 - It allows experimental features with a possibly unstable configuration
   interface to be developed using the special `next` version of the schema.
 
 ## Mapping Pacemaker Versions to Schema Versions
 
 | Pacemaker | Latest Schema | Changed
 | --------- | ------------- | ----------------------------------------------
+| `1.1.18`  | `2.10`        | `resources`, `alerts`
 | `1.1.17`  | `2.9`         | `resources`, `rule`
 | `1.1.16`  | `2.6`         | `constraints`
 | `1.1.15`  | `2.5`         | `alerts`
 | `1.1.14`  | `2.4`         | `fencing`
 | `1.1.13`  | `2.3`         | `constraints`
 | `1.1.12`  | `2.0`         | `nodes`, `nvset`, `resources`, `tags` + `acls`
 | `1.1.8`+  | `1.2`         |
 
 ## Schema generation
 
 Each logical portion of the schema goes into its own RNG file, named like
 `${base}-${X}.${Y}.rng`. `${base}` identifies the portion of the schema
 (e.g. constraints, resources); ${X}.${Y} is the latest schema version that
 contained changes in this portion of the schema.
 
 The complete, overall schema, `pacemaker-${X}.${Y}.rng`, is automatically
 generated from the other files via the Makefile.
 
 # Updating schema files #
 
 ## Experimental features ##
 
 Experimental features go into `${base}-next.rng` where `${base}` is the
 affected portion of the schema. If such a file does not already exist,
 create it by copying the most recent `${base}-${X}.${Y}.rng`.
 
 Pacemaker will not use the experimental schema by default; the cluster
 administrator must explicitly set the `validate-with` property appropriately to
 use it.
 
 ## Stable features ##
 
 The current stable version is determined at runtime when
 crm_schema_init() scans the CRM_DTD_DIRECTORY.
 
 It will have the form `pacemaker-${X}.${Y}` and the highest
 `${X}.${Y}` wins.
 
 ### Simple Additions
 
 When the new syntax is a simple addition to the previous one, create a
 new entry, incrementing `${Y}`.
 
 ### Feature Removal or otherwise Incompatible Changes
 
 When the new syntax is not a simple addition to the previous one,
 create a new entry, incrementing `${X}` and setting `${Y} = 0`.
 
 An XSLT file is also required that converts an old syntax to the new
 one and must be named `upgrade-${Xold}.${Yold}.xsl`.
 
 See `xml/upgrade-1.3.xsl` for an example.
 
 ### General Procedure
 
 1. Copy the most recent version of `${base}-*.rng` to `${base}-${X}.${Y}.rng` 
 1. Commit the copy, e.g. `"Low: xml: clone ${base} schema in preparation for
    changes"`. This way, the actual change will be obvious in the commit history.
 1. Modify `${base}-${X}.${Y}.rng` as required.
 1. If required, add an XSLT file, and update `xslt_SCRIPTS` in `xml/Makefile.am`.
 1. Commit
 1. `make -C xml clean; make -C xml all` to rebuild the schemas in the local
    source directory.
 1. The CIB validity regression tests will break after the schema is updated.
    Run `tools/regression.sh` to get the new output,
    `diff tools/regression.validity.{out,exp}` to ensure the changes look correct,
    `cp tools/regression.validity.{out,exp}` to update the expected output,
    then commit the change.
 
 ## Using a New Schema
 
 New features will not be available until the cluster administrator:
 
 1. Updates all the nodes
 1. Runs the equivalent of `cibadmin --upgrade --force`
 
 ## Random Notes
 
 From the source directory, run `make -C xml diff` to see the changes
 in the current schema (compared to the previous ones) and also the
 pending changes in `pacemaker-next`.
 Alternatively, if the intention is to grok the overall historical schema
 evolution, use `make -C xml fulldiff`.