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# 1.4. references Class

## Interface

The general syntax is:

      !block references[; parameters]
      table of objects
      !endblock

The object attributes are:

Field | Category | Rule
Reference | mandatory |
Document | optional |
Jump | optional |
Version | optional |
Status | optional |

See Understanding Class Interfaces, if necessary.

## Description

The references filter is used to declare a set of references and matching documents. It can also be used to build a table of references within a document.

The attributes supported are:

Attribute | Description
Reference | the document code
Document | the document name
Version | the document version
Status | the document status
Jump | the URL, if any

## Examples

See the `sdf.sdm` and `document.reg` files within SDF's `sdf` directory.