+enum conf_sortkey_type
+{
+ Metadata_sortkey_relevance,
+ Metadata_sortkey_numeric, // Standard numerical sorting
+ Metadata_sortkey_skiparticle, // Skip leading article when sorting
+ Metadata_sortkey_string // Flat string
+};
+
+// Describes known metadata elements and how they are to be manipulated
+// An array of these structure provides a 'map' against which discovered metadata
+// elements are matched. It also governs storage, to minimize number of cycles needed
+// at various tages of processing
+struct conf_metadata
+{
+ char *name; // The name of this element. Output by normalization stylesheet
+ int brief; // Is this element to be returned in the brief format?
+ int termlist;// Is this field to be treated as a termlist for browsing?
+ int rank; // Rank factor. 0 means don't use this field for ranking, 1 is default
+ // values >1 give additional significance to a field
+ int sortkey_offset; // -1 if it's not a sortkey, otherwise index
+ // into service/record_cluster->sortkey array
+ enum
+ {
+ Metadata_type_generic, // Generic text field
+ Metadata_type_number, // A number
+ Metadata_type_year // A number
+ } type;
+ enum
+ {
+ Metadata_merge_no, // Don't merge
+ Metadata_merge_unique, // Include unique elements in merged block
+ Metadata_merge_longest, // Include the longest (strlen) value
+ Metadata_merge_range, // Store value as a range of lowest-highest
+ Metadata_merge_all // Just include all elements found
+ } merge;
+};
+
+// Controls sorting
+struct conf_sortkey