starting and ending at the given fractions of total 2d length.
Second and third arguments are float8 values between 0 and
1. This only works with LINESTRINGs.
- To use with contiguous MULTILINESTRINGs use in conjunction with ST_LineMerge.</para>
+ To use with contiguous MULTILINESTRINGs use in conjunction with <xref linkend="ST_LineMerge" />.</para>
<para>If 'start' and 'end' have the same value this is equivalent
to <xref linkend="ST_Line_Interpolate_Point" />.</para>