The <relheader> element is a row of column definitions (<relcolspec> elements) in a relationship table. Each table can have only one set of column definitions.
| Doctype | Content model | 
|---|---|
| map, bookmap | ( relcolspec) (one or more) | 
| Doctype | Parents | 
|---|---|
| bookmap, map | reltable | 
- map/relheader
| Name | Description | Data Type | Default Value | Required? | 
|---|---|---|---|---|
| %univ-atts; (%select-atts;, %id-atts;, %localization-atts;) | A set of related attributes, described at %univ-atts; | parameter entity | PE not applicable | Not applicable | 
| %global-atts; (xtrf, xtrc) | A set of related attributes, described at %global-atts; | parameter entity | PE not applicable | Not applicable | 
| class | Common attribute described in Other common DITA attributes. | 
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OASIS DITA Version 1.1 Language Specification -- Committee Specification, 31 May 2007 
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