# Manual documentation seems lacking

**URL:** <https://forum.liquibase.org/t/manual-documentation-seems-lacking/1613>\
**Category:** General Discussion\
**Created:** [September 6, 2011, 11:42am UTC](https://forum.liquibase.org/t/manual-documentation-seems-lacking/1613 "2011-09-06T11:42:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![flyingknee](https://avatars.discourse-cdn.com/v4/letter/f/34f0e0/32.png) [@flyingknee](https://forum.liquibase.org/u/flyingknee)\
**Post date:** [September 6, 2011, 11:42am UTC](https://forum.liquibase.org/t/manual-documentation-seems-lacking/1613/1 "2011-09-06T11:42:00Z")

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I am looking for more documentation on the uses of the changeset elements and attributes. I have scoured the site but I can’t find any detailed documentation.

- For example, what is the difference between the defaultValue attribute and defaultValueBoolean attributes of column? &nbsp;Which one am I supposed to use to define a default value for a column?
- How do you define a multi-column uniqueness constraint?
- What are the valid options for the type attribute of the element?
- Where should the liquibase.properties file reside and what values should it contain? &nbsp;I feel this is important information that is not even mentioned in the manual. Or it is just not evident where to look for it on the liquibase site.

Thank you.

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**Author:** ![ljnelson](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.liquibase.org/ljnelson/32/120_2.png) [@ljnelson](https://forum.liquibase.org/u/ljnelson)\
**Post date:** [September 6, 2011, 11:42am UTC](https://forum.liquibase.org/t/manual-documentation-seems-lacking/1613/2 "2011-09-06T11:42:00Z")

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Hi; I can’t speak to the manual but I can answer your questions.

- 

Hope that helps!  
  
Best,  
Laird