Specification of Filter Expression

The arguments to fn_search_filter_create() are a return status, an expression string, and a list of arguments. The string contains the filter expression with substitution tokens for the attributes, attribute values, strings and identifiers that are part of the expression. The remaining list of arguments contains the attributes and values in the order of appearance of their corresponding substitution tokens in the expression. The arguments are of types FN_attribute_t*, FN_attrvalue_t*, FN_string_t* or FN_identifier_t*.

Except when attributes appear as arguments in specially defined extended operations, any attribute values in an FN_attribute_t type of argument are ignored; only the attribute identifier and attribute syntax are relevant. The argument type expected by each substitution token is listed in Table 2-6.