# Documentation for SMS2

**URL:** <https://community.stardog.com/t/documentation-for-sms2/3358>\
**Category:** Support\
**Created:** [November 3, 2021, 1:53pm UTC](https://community.stardog.com/t/documentation-for-sms2/3358 "2021-11-03T13:53:15Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![oli666](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.stardog.com/oli666/32/1019_2.png) [@oli666](https://community.stardog.com/u/oli666)\
**Post date:** [November 3, 2021, 1:53pm UTC](https://community.stardog.com/t/documentation-for-sms2/3358/1 "2021-11-03T13:53:15Z")

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Hi,

following up with a prior question posted, are there any documents about SMS2 on top what is included in the virtual graph / data sources sections?

[SMS2 Documentation - Support - Stardog Community](https://community.stardog.com/t/sms2-documentation/3027)

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**Author:** ![albaker](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.stardog.com/albaker/32/632_2.png) [@albaker](https://community.stardog.com/u/albaker)\
**Post date:** [November 10, 2021, 1:42am UTC](https://community.stardog.com/t/documentation-for-sms2/3358/2 "2021-11-10T01:42:27Z")

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There is some additional training available on the website under Trainings. I would recommend both the virtual graph discussion as well as modeling and performance.

> **[Trainings - Trainings | Stardog](https://www.stardog.com/trainings/)**
>
> Unify your data with Stardog's Knowledge Graph. Break the cycle of repeatedly copying and transforming your data

Are you looking for something in particular?

Al

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<div class="post-metadata">

**Author:** ![oli666](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.stardog.com/oli666/32/1019_2.png) [@oli666](https://community.stardog.com/u/oli666)\
**Post date:** [November 10, 2021, 3:40pm UTC](https://community.stardog.com/t/documentation-for-sms2/3358/3 "2021-11-10T15:40:46Z")

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Hi Al,

I was mainly looking for any sort of documentation for "special variables" like for example the " **row\_number**" one for csv import.

Specifically looking for variables that might help me to solve the issue [SMS2: ID for JSON Lists - Support - Stardog Community](https://community.stardog.com/t/sms2-id-for-json-lists/3354)

Thanks,

Oli

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**Author:** ![albaker](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.stardog.com/albaker/32/632_2.png) [@albaker](https://community.stardog.com/u/albaker)\
**Post date:** [November 11, 2021, 2:05pm UTC](https://community.stardog.com/t/documentation-for-sms2/3358/4 "2021-11-11T14:05:29Z")

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Hi Oli,

Unfortunately we don't support what you referenced in that other question. If you need to take a structure like that and generate indexes - which you could do with additional triples, or perhaps even edge properties, you'd have to do that in an ETL job and not with SMS2 mappings or virtual graphs.

Thanks,  
Al

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**Author:** ![system](https://canada1.discourse-cdn.com/flex030/uploads/stardog/original/2X/e/ed66b48a616f505106a4acde3c9cee7e6da9bc67.svg) [@system](https://community.stardog.com/u/system)\
**Post date:** [November 25, 2021, 2:06pm UTC](https://community.stardog.com/t/documentation-for-sms2/3358/5 "2021-11-25T14:06:27Z")

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