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  Sx_IndexType():

  Syntax:   Sx_IndexType( [nOrder | cIndexName] )

            nOrder     = The index order
            cIndexName = The index name

  Returns:  Numeric value as follows:

               1 = Non-Compact IDX
               2 = Compact IDX or a single-tag NSX
               3 = Compound (CDX or NSX)

  Description:  This function returns a numeric value signifying the type
                of the current or specified index.

    NOTE:  This function is NOT supported under SIXNTX.

  Example:

    #include "SIXCDX.CH"

    USE test VIA "SIXCDX"

    INDEX ON test->LAST TO LAST NONCOMPACT    // Creates LAST.IDX
    ? Sx_IndexType()                          // 1

    INDEX ON test->AGE TO AGE                 // Creates AGE.IDX
    ? Sx_IndexType()                          // 2

    INDEX ON test->STATE TAG STATE            // Creates TEST.CDX
    ? Sx_IndexType()                          // 3