11.9 SharePoint Portal Server Filters

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Filters are used to reach specific file format types. Natively SharePoint Portal Server includes filters for:

• Microsoft Office documents

• HTML files

• Tagged Image File Format (TIFF) files

• Text files

The TIFF filter enables SharePoint Portal Server to crawl the textual content of saved fax data based on Optical Character Recognition (OCR) technology. SharePoint Portal Server uses the Multipurpose Internet Mail Extensions (MIME) filter that ships with Windows 2000 when filtering messages from Exchange public folders.

SharePoint Portal Server also supports third-party and custom file types, such as the Adobe PDF filter, and a number of vendors are providing filters for their file formats.

SharePoint Portal Server uses SQL full-text extensions. Queries are submitted using Distributed Authoring and Versioning Searching and Locating (DASL) requests-part of HTTPDAV, which is HTTP Document Authoring and Versioning.

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