This string is formatted as follows:

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[unique]-{path type}-{node type}-{key type}-{syntax type}

where:

• unique is the actual value that you provide in this position on the string. If you provide this value, then indexed values must be unique. If you do not want indexed values to be unique, provide nothing for this position in the string.

  See Uniqueness for more information.

• {path type} identifies the path type. Valid values are:
  • node
  • edge

  See Path Types for more information.

• {node type} identifies the type of node being indexed. Valid values are:
  • element
  • attribute
  • metadata

  If metadata is specified, then {path type} must be node. See Node Types for more information.

• {key type} identifies the sort of test that the index supports. The following key types are supported:
  • presence
  • equality
  • substring

  See Key Types for more information.

• {syntax type} identifies the syntax to use for the indexed value. Specify one of the following values:
  • AnySimpleType
  • AnyUri
  • Base64Binary
  • Binary
  • Boolean
  • Date
  • DateTime
  • DaytimeDuration
  • Decimal
  • Double
  • Duration
  • Float
  • GDay
  • GMonth
  • GYear
  • GYearMonth
  • HexBinary
  • Node
  • None
  • Notation
  • QName
  • String
  • Time
  • UntypedAtomic
  • YearMonthDuration
  If the key type is presence, then the syntax type should be none. Also, for queries that examine numerical data without specifying the cast explicitly, use double instead of decimal for the index. This is because the XQuery specification requires implict casts of numerical data to be performed as a double.

The following are some example index strategies:

• node-element-presence-none
• unique-node-metadata-equality-string
• edge-attribute-equality-float

Also, be aware that you can specify multiple indices at a time by providing a space-separated (or comma-separated)list of index strategies in the string. For example, you can specify two index strategies at a time using:

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node-element-presence-none edge-attribute-equality-float