tsd:strength

Valid values for the value attribute are:

• "primary"
  Level 1: base character comparison, e.g., "a" < "b".

• "secondary"
  Level 2: accents on characters are compared, e.g. "as" < "às" < "at".

• "tertiary"
  Level 3 (default): uppercase and lowercase characters are compared, e.g. "ao" < "Ao" < "aò". This is ignored if a difference is found on level 1 or level 2.

• "quaternary"
  Level 4: distinguish word with and without punctuation, e.g. "ab" < "a-b" < "aB". This is ignored if a difference is found on level 1-3, and should be used only if a distinction based on punctuation is required.

• "identical"
  Level 5: Used if levels 1-4 yield identical results. The Unicode point values are compared. Note that this level of comparison can impact performance negatively.

Note:
This is the default root locale, i.e. the default collation attribute value according to the Unicode Collation Algorithm. However, this may be different if a specific language/locale is specified. For more information, refer to tsd:collation and to the collation documentation in the XML Schema User Guide.