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Metadata can be filtered, after loading it and but before its use. Filters are specified as a series of <MetadataFilter> elements, which are processed in the order in which they occur as children of the containing <MetadataProvider>Filters are all element.

Like metadata providers, metadata filters are defined by their xsi:type attribute.  All other attributes and child elements are specific to each filter. The filter types provided are:

• Chaining Filter (DEPRECATED)
  • Normally automatically applied whenever multiple filters appear, this wraps multiple filters into a chain, running each one in turn
    
• RequiredValidUntil Filter
  • Important for secure processing of metadata containing keys, it enforces requirements for this filter forces the metadata to carry an expiration date and limits the size of that windowthe corresponding validity interval
    
• SchemaValidation Filter
  • Performs XML schema validation of a on the metadata source
    
• SignatureValidation Filter
  • The most A common filter , that checks the signature on a signed metadata source
    
• EntityRoleWhiteList Filter
  • A memory-saving filter , it that deletes unneeded role information from the metadata
    
• EntityAttributes Filter
  • A policy aid, this filter actually adds information, allowing "tags" to be attached to metadata for use in other parts of the system
• Predicate Metadata Filter
  • An extensible allow/deny filter , it can remove that removes matching (or keep keeps only matching) entities based on a set of built-in rules, or with an arbitrary condition
• NameIDFormat Filter ^3.3
  • A policy aid, this filter adds information, allowing <NameIDFormat> elements to be attached to metadata for use in driving identifier format selection.

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