# IDataSource.Organise()

Description:

The `Organise` method adds landmarks to a landmark category (association) or removes landmarks from a landmark category (disassociation). The same landmark can belong to multiple categories or to no category.

This is a synchronous method.

Syntax:

    result = so.IDataSource.Organise(criteria);

Arguments:

- `criteria`:

  This is an object that specifies which landmarks to associate or disassociate and with which landmark category. For more information about the object properties and how to define them, see section Criteria for organizing landmarks in a landmark category.

Return value:

The `Organise` method returns an object that contains an error code and an error message.

Table: Return value properties for Export
Property | Description | Value
--- | --- | ---
`result.ErrorCode` | This is a number that specifies a predefined error code. | See Service API error codes.
`result.ErrorMessage` | This is a text string that describes the error. | See Landmarks Service API error messages.

Remarks:

- If no landmark database is specified, `Organise` is performed on the default database. If the default database does not exist, it is created and set active. The default database is `file://c:eposlm.ldb`.

- For more information about landmarks, landmark categories, and landmark databases, see the Landmarks Service overview page.

Example code:

For the complete source of a sample widget that demonstrates how to use this Service API, see the full example.