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Version: 4.49.0-beta

Content Store

The Content Store is the Xill4 database concept for storing any type of content targeting migrations. It uses a Mongo database and a combination of schemas. In Mongo terminology each data record stored is called a (BSON) document, to avoid conflicting terminology when talking about documents or content from an external repository the term RECORD is used when referring to an actual file or document.

A very important concept about the Content Store is that each migratable object is stored separately.

Kinds of content​

It distinguishes eight different kinds of content:

  • ROOT
  • CONTAINER
  • RECORD
  • BINARY
  • RELATION
  • ACL
  • AUDITLOG
  • PRINCIPAL

The CONTAINER, RECORD and BINARY are the three most important ones, because together they form about 80% of the actual content.

ROOT​

The ROOT document(s) are the starting point(s) of a migration. They hold the ID of the target repository container objects where the migrated content needs to land.

CONTAINER​

The CONTAINER kind is used for hierarchical content types like folders, sites, documentLibraries, archives, sub-sites, lists.

RECORD​

The RECORD kind is used for any actual content like pages, paragraphs, list-items, documents. It holds the metadata and references to the actual binaries. For a representing a file-system this means that each file will have both a RECORD document and a BINARY document stored.

BINARY​

The BINARY kind is used when representing physical file. It holds the metadata about the files and contains a reference to its location.

RELATION​

The RELATION kind is used for relationship type of objects other than representing a parent-child structure and (language) versions.

ACL​

The ACL kind is used for representing access control list objects.

AUDITLOG​

The AUDITLOG kind is used for representing audit log objects.

PRINCIPAL​

The PRINCIPAL kind is used for representing user and group objects.

Schemas

To store these different kinds of content, the Content Store supports 6 different schemas. Schemas describe the requirements of the content being stored in the Content Store.

The selection below describes the different schemas and there purpose.

Root schema​

The root schema is used for the ROOT kind.

Content schema​

The content schema can be considered the main schema. It is used for the CONTAINER and RECORD kinds.

Binary schema​

The binary schema is used for the BINARY kind.

Relation schema​

The relation schema is used for the RELATION kind.

note

This schema is in a beta state and is highly subjected to change.

ACL schema​

The ACL schema is used for the ACL kind.

note

This schema is in an alpha state and is highly subjected to change.

AuditLog schema​

The AuditLog schema is used for the AUDITLOG kind.

note

This schema is in an alpha state and is highly subjected to change.

Principal schema​

The Principal schema is used for the PRINCIPAL kind.

Storing binaries​

Besides the metadata, the Content Store is also able to store binary content. It does this using a technique called GridFS. That is why components that work with binary files will have a Mongo database connection string and a database name.

GridFS consist of two collections binaries.files and binaries.chunks.