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The Compound Solution pack module adds the ability to allows you to create what are called "compound objects." Compound objects function as "parent" objects that gather together one or more "child" objects. Child objects can be created with any other Islandora solution pack and have their own metadata. When you associate Islandora objects with a parent compound object, the parent-child relationship is recorded in the RELS-EXT structural metadata of the child objects (see bottom of page for sample RELS-EXT). Order Sequencing information can also be recorded in the RELS-EXT metadata so child objects can be displayed in a sequencetheir proper order.

For example, a scanned postcard with a front and back view would have the following structure:

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Install as usual, see this for further information.If utilizing the lazy loading image ability of the solution pack, the JAIL library must be present within sites/all/libraries/JAIL.

Enable the Islandora compound object module (admin/modules). There are two block options for displaying compound objects within Islandora.  Select one of the following:

• The first is the default "Islandora Compound Object Navigation" block. Go to admin/structure/block/manage/islandora_compound_object/compound_navigation/configure to find navigation controls and load all objects related to the parent compound. 
• The second is the "Islandora Compound Object JAIL Display" block. Go to admin/structure/block/manage/islandora_compound_object/compound_jail_display/configure to use the JAIL library, which allows for lazy loading of images. This allows the block to load images only when they are being accessed which will greatly increase performance on compounds with many children. 

If utilizing the lazy loading image ability of the solution pack, the JAIL library must be present within sites/all/libraries/JAIL.

Configuration

Set the 'Child relationship predicate' and 'Solr filter query', as well as select options in Administration » Islandora » Solution pack configuration » Compound Object Solution Pack (admin/islandora/solution_pack_config/compound_object).

1. Only allow compound objects to have child objects associated with them.
   • Checked: you can only add child objects to Islandora objects with the "Compound Solution Pack" type.
   • Unchecked: all objects can have child objects. [This option is useful if you want to, say, make the front of a postcard the parent and the back the child – without the need of real "Compound Object."]
2. Generate a thumbnail for compound objects from their first child.
   • Checked: A thumbnail will be generated and attached to the compound object as a TN datastream.
   • Unchecked: No thumbnail is generated and a system default thumbnail will display.
3. Hide child objects in RI results
   • Checked: Child objects will not be displayed in the Islandora browse. Only parent objects will display.
   • Unchecked: Child objects and parent objects will be displayed in the Islandora browse.
4. Hide child objects in Solr results
   1. Checked: Child objects will not be displayed in Solr search results. Only parent objects will display.
   2. Unchecked: Child objects and parent objects will be displayed in the Islandora search.
5. Solr Filter Query
   • This is the query that enables the "Hide child objects in Solr results" function. The default value is `-RELS_EXT_isConstituentOf_uri_mt:[* TO *]`
6. Child relationship predicate
   • This is the statement in the RELS-EXT metadata that associates child objects with parent objects. The default value is `isConstituentOf`
7. Use alternative, autoloading display for compounds?
   • Checked: Enables the JAIL display (dependencies and blocks also need to be configured. See the documentation for "Installation" and "Display" for more information.)
   • Unchecked: The default display will be used.
8. Display compound object parents in the breadcrumbs on children objects
   • Checked: The parent object will appear in the breadcrumb navigation.
   • Unchecked: The parent object will not appear in the breadcrumb navigation.
9. Compound Member Query
   • (Default) Legacy SPARQL - Does a SPARQL query followed by an access check. 
   • SPARQL - Does a SPARQL query with filters. Generally faster than the default option.

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1. Go to parent collection.
2. Click "Manage".
3. Enable the "Compound Object" object under "Collection" tab, then click "Update Collection Policy".
4. After adding compound objects to your Collection Policy, you will be able to click the "Overview" tab and "Add an Object".
5. Select "Islandora Compound Object Content Model" then "Next".
6. Select your metadata form, such as the "Compound Object MODS form", then "Next". [If prompted for a MARCXML file, choose that file if you have one. If you do not have one, just click "Next."]
7. Fill in your metadata form form then click "Next".
   • Compound objects do not have content datastreams. This process creates a "parent" compound object that child objects can be associated with. The content is attached to the child objects.
8. After the compound object has been created, go to "Manage" > "Compound" to associate objects with the parent compound object.
   
   • Child objects must already exist in your repository before you can add them.
9. Under the "Add Child Object" field, enter the PID for each object to be added to the compound object.
   
   • Child objects can only be added one at a time. The "Child Object Pid/Label" box has an autocomplete function that searches for objects by label or PID.

10. Click "Save" when all the child objects are associated with the parent objects.

Once a child has been added to the compound, the view of the compound will use the metadata and thumbnail from the first object to render the main object view. To reorder objects, go to the parent object's Manage tab, select "Compound", and use the "Reorder" list. If you do reorder the child objects, be sure to click "Save changes" in the "Reorder" fieldset.

Child objects can be removed from parent objects from the parent object Manage >Compound tab. This removes the association from the RELS-EXT metadata but does not remove the child object from the repository.

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There are two block options for displaying compound objects within Islandora. The default "Islandora Compound Object Navigation" block will provide navigation controls and loading of all objects related to the parent compound. The second option "Islandora Compound Object JAIL Display," is a block utilizing the JAIL library which allows for "lazy loading" of images. This allows the block to load images only when they are being accessed, which will greatly increase performance on compound objects with many children.See the "Installation" section for more information about the two display options.

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The "Islandora Compound Object Navigation" block can be themed. See theme_islandora_compound_prev_next().

Drush

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Correcting out-of-date child object relationships

Previous versions of this module (Islandora 7.x-1.2 and earlier) had a different predicate in the RELS-EXT to associate child objects with parent objects. To update to the new compound object predicate, run the drush command `update_rels_predicate` from the command line. This will update the predicates of existing compound objects to `isConstituentOf`. This command accepts no arguments.

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The Compound Solution Pack comes with the following objects in http://path.to.your.site/admin/islandora/solution_packs:Content Models:

• Islandora Compound Object Content Model (islandora:compoundCModel)
• Compound Collection (islandora:compound_collection)

A parent object created using the Compound Solution Pack's content model will compoundCModel will have the following datastreams:

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The Compound Solution Pack comes with the "Compound Object MODS form" for editing the MODS datastream (admin/islandora/xmlform).

Sample RELS-EXT for Parent Object (Compound Object)

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