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The aiming point is not the same position as the centre point of a TLOF. According to ICAO Annex 14, Volume II,

The geographical coordinates of the geometric centre of the TLOF and/or of each threshold of the FATO (where appropriate) shall be measured and reported to the aeronautical information services authority

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An aiming point marking should be provided at a heliport where it is necessary for a pilot to make an approach to a particular point before proceeding to the TLOF.

The aiming point marking shall be located within the FATO.

Currently in AIXM 5, it is not possible to define the two different points for a TLOF. Anyhow, it seems that the The relationship hasAimingPoint and the property TLOF.aimingPoint is not correct. It should be rather hasCentrePoint and TLOF.centrePoint.  Also, an aiming point may be independent from a TLOF and may also be marked and lighted.Workaround for were incorrectly named in AIXM, as the real intention was to model the TLOF centre point. The aiming point is more appropriately modelled as a RunwayCentrelinePoint, because it is always on a FATO (which in AIXM is modelled as a Runway of type FATO). Therefore, the following workaround is used in AIXM 5.1(.1):

• In case only the TLOF centre point location shall be encoded use aimingPoint.
• In case both locations shall be encoded use aimingPint for the aiming point and code the centre point location as Note.

Status AIXM 5.1: See CCB AIXM-268

• using the TLOF.aimingPoint;
• in case a true "FATO aiming point" is also provided, this will be coded as a RunwayCentrelinePoint with role equal-to 'OTHER:HEL_AIMING_PT' and associated with the RunwayDirection of the Runway that plays the FATO role for the TLOF.