AO空间查询相同多边形问题？？急！

在AO中怎么利用ISpatialFilter接口搜寻某图层中是否存在与待搜寻的Polygon相同形状的要素，接口中的空间关系好像没有找到。而MO中的SearchSahape方法就有MoIdential来实现。请问我该怎么做啊？谢谢！

<P>空间查询有以下几种关系了，在帮助里有详细说明</P>
<P>
<TABLE cellSpacing=4 cols=3 cellPadding=4>

<TR vAlign=top>
<TH width="43%">Constant</TH>
<TH width="25%">Value</TH>
<TH width="32%">Description</TH></TR>
<TR vAlign=top>
<TD class=t width="43%"><B>esriSpatialRelUndefined</B></TD>
<TD class=t align=left width="25%">0</TD>
<TD class=t align=left width="32%">No Defined Spatial Relationship.</TD></TR>
<TR vAlign=top>
<TD class=t width="43%"><B>esriSpatialRelIntersects</B></TD>
<TD class=t align=left width="25%">1</TD>
<TD class=t align=left width="32%">Query Geometry Intersects Target Geometry.</TD></TR>
<TR vAlign=top>
<TD class=t width="43%"><B>esriSpatialRelEnvelopeIntersects</B></TD>
<TD class=t align=left width="25%">2</TD>
<TD class=t align=left width="32%">Envelope of Query Geometry Intersects Envelope of Target Geometry.</TD></TR>
<TR vAlign=top>
<TD class=t width="43%"><B>esriSpatialRelIndexIntersects</B></TD>
<TD class=t align=left width="25%">3</TD>
<TD class=t align=left width="32%">Query Geometry Intersects Index entry for Target Geometry (Primary Index Filter).</TD></TR>
<TR vAlign=top>
<TD class=t width="43%"><B>esriSpatialRelTouches</B></TD>
<TD class=t align=left width="25%">4</TD>
<TD class=t align=left width="32%">Query Geometry Touches Target Geometry.</TD></TR>
<TR vAlign=top>
<TD class=t width="43%"><B>esriSpatialRelOverlaps</B></TD>
<TD class=t align=left width="25%">5</TD>
<TD class=t align=left width="32%">Query Geometry Overlaps Target Geometry.</TD></TR>
<TR vAlign=top>
<TD class=t width="43%"><B>esriSpatialRelCrosses</B></TD>
<TD class=t align=left width="25%">6</TD>
<TD class=t align=left width="32%">Query Geometry Crosses Target Geometry.</TD></TR>
<TR vAlign=top>
<TD class=t width="43%"><B>esriSpatialRelWithin</B></TD>
<TD class=t align=left width="25%">7</TD>
<TD class=t align=left width="32%">Query Geometry is Within Target Geometry.</TD></TR>
<TR vAlign=top>
<TD class=t width="43%"><B>esriSpatialRelContains</B></TD>
<TD class=t align=left width="25%">8</TD>
<TD class=t align=left width="32%">Query Geometry Contains Target Geometry.</TD></TR>
<TR vAlign=top>
<TD class=t width="43%"><B>esriSpatialRelRelation</B></TD>
<TD class=t align=left width="25%">9</TD>
<TD class=t align=left width="32%">Query geometry IBE(Interior-Boundary-Exterior) relationship with target geometry.</TD></TR></TABLE></P>

<P>下面这个应该可以满足要求</P>
<P><STRONG>esriSpatialRelOverlaps</STRONG> <BR><BR>Returns a feature if the intersection of the two shapes results in an object of the same dimension, but different from both of the shapes. Applies to Area/Area, Line/Line, and Multi-point/Multi-point shape type combinations. </P>

可以用最后一种关系来自定义所需的图形查询。

<P><FONT size=1>我尝试过esriSpatialRelOverlaps，但是不能实现我需要的功能。我的操作是先指定一个多边形导入至数据库中，然后针对这一多边形再导入，发现利用esriSpatialRelOverlaps 得到的Feature为空。至于自定义所需的图形查询该怎么用。谢谢！</FONT></P>