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From "Graham Wallis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ATLAS-1768) Create common types for Open Metadata
Date Thu, 01 Jun 2017 14:34:04 GMT

    [ https://issues.apache.org/jira/browse/ATLAS-1768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16033075#comment-16033075
] 

Graham Wallis commented on ATLAS-1768:
--------------------------------------

[~mandy_chessell] Thanks Mandy - that makes sense. Sorry I was thinking in type-space rather
than instance-space. Presumably when we create the new vertex we are not copying any relationships
(edges) from the original to the new (chained) vertex. That sounds good and avoids the problem
alluded to by Ian Robinson in his versioned graphs article, in the case where current state
is superimposed on identity (which appears to be the model we have in Atlas). I assume that
the relationships (edges) are always and only on the original vertex, and that they are time-boxed
by their start and end timestamps. Is that correct?

> Create common types for Open Metadata
> -------------------------------------
>
>                 Key: ATLAS-1768
>                 URL: https://issues.apache.org/jira/browse/ATLAS-1768
>             Project: Atlas
>          Issue Type: New Feature
>          Components:  atlas-core
>    Affects Versions: 0.9-incubating
>            Reporter: Mandy Chessell
>            Assignee: Mandy Chessell
>              Labels: OpenMetadata
>
> This JIRA describes a proposal for standard types for open metadata entities and relationships.
 For example, glossaries, database definitions, rules, policies, ...
> The value of having standard definitions for metadata is to enable type safe APIs and
business level UIs plus be able to exchange metadata between different instances of metadata
repositories.
> The implementation of these common types is divided into 8 areas:
> * Area 0 - for extensions to Apache Atlas's base model
> * Area 1 - for definitions of the data-related assets we are governing and using
> * Area 2 - for a glossary of meanings and semantic relationships
> * Area 3 - for information about asset use, crowd-sourced definitions and collaboration
around the data-related assets
> * Area 4 - for governance such as policies, rules and classifications
> * Area 5 - for reference models and reference data
> * Area 6 - for metadata discovery processes (see https://issues.apache.org/jira/browse/ATLAS-1748)
> * Area 7 - for lineage
> Adaptation and flexibility are key in metadata environments so these common definitions
must be extensible - and we still need to support the ad hoc definition of new types in Atlas.
> Apache Atlas supports meta-types that are used in the definition of new types.  These
are currently enumeration, struct, classification and entity.  JIRA https://issues.apache.org/jira/browse/ATLAS-1690
adds relationships to this list.  The open metadata models make use of all of these meta-types.
 These are represented by sterotypes on the classes of the open metadata definitions.
> The Atlas wiki has the models as a set of linked pages which are probably the easiest
way to view the models.
> Start here: https://cwiki.apache.org/confluence/display/ATLAS/Building+out+the+Apache+Atlas+Typesystem



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