In the field of data warehouses, a document warehouse is a software framework

Software framework

In computer programming, a software framework is an abstraction in which software providing generic functionality can be selectively changed by user code, thus providing application specific software...

 for analysis, sharing, and reuse of unstructured data

Unstructured data

Unstructured Data refers to information that either does not have a pre-defined data model and/or does not fit well into relational tables. Unstructured information is typically text-heavy, but may contain data such as dates, numbers, and facts as well...

, such as textual

Written language

A written language is the representation of a language by means of a writing system. Written language is an invention in that it must be taught to children, who will instinctively learn or create spoken or gestural languages....

 or multimedia

Multimedia

Multimedia is media and content that uses a combination of different content forms. The term can be used as a noun or as an adjective describing a medium as having multiple content forms. The term is used in contrast to media which use only rudimentary computer display such as text-only, or...

 documents.
This is different from data warehouse

Data warehouse

In computing, a data warehouse is a database used for reporting and analysis. The data stored in the warehouse is uploaded from the operational systems. The data may pass through an operational data store for additional operations before it is used in the DW for reporting.A data warehouse...

s that focuses on structured data, such as tabelarized sales reports.

On the other hand, Document Warehouse for SAP is also a FileNet

FileNet

FileNet, a company acquired by IBM, developed software to help enterprises manage their content and business processes. The FileNet P8 platform, their flagship system, is a framework for developing custom enterprise systems, offering much functionality out of the box and capable of being customized...

's commercial software that enables SAP

SAP AG

SAP AG is a German software corporation that makes enterprise software to manage business operations and customer relations. Headquartered in Walldorf, Baden-Württemberg, with regional offices around the world, SAP is the market leader in enterprise application software...

's business applications to access document images stored by FileNet.