The tia core Meta Service provides functions for managing metadata. Metadata describes the properties of documents and According to the CMIS specification there are predefined standard properties describing documents. Next to the standard CMIS properties additional properties are defined according to the CMIS model of Secondary Types. The definition of Secondary Types may be driven by following sources:
kgs tia Core
SAP
Customer
Metadata are used to search for documents and to store information, which will be available even without the origin system (e. Metadata are stored in databases (SQL format) or in search engines (NoSQL format). Tia core currently supports the SQL databases MSSQL Server, Oracle and IBM DB2 and Elasticsearch as a search engine.
The Meta Service is used via the tia core configuration file. If Meta Service is activated and parameterized, metadata is saved accordingly and can be used to search for documents.
When can and should the Meta Service be activated? Meta Service must be activated for tia core in tia CMIS, because CMIS is based on searching for documents via metadata. However, Meta Service can also be activated for tia core in tia sapphttp g. SAP). The Metadata Service stores its data in a relational database (MSSQL, Oracle, IBM DB2, H2) or in indexes of an object storage (Elasticsearch).
The Configuration Service defines how the Metadata Service will work. The Metadata Service is generally mandatory when using tia Core with CMIS, because an metadata-index is used to find and retrieve documents. However, Meta Service should also be activated when using tia core with tia saphttp or as a bundle in tia OSGi content server for SAP Archivelink protocol. Activation makes sense if documents saved via Archivelink are also to be searched for via tia CMIS. Even if SAP-Archivelink does not provide any metadata, at least tia core saves system-required metadata for localizing the documents saved via SAP-ArchivelinkOnly when using tia Core with SAPALINK or as a proxy, then the Metadata Service would not be required.