地图规则Expressions

The地图规则出口ession provides information about mapping rules. It is represented in the xfMap document with the元素，并具有以下一般形式：

The出口ession string (i.e., the出口属性）指定映射规则信息的类型。

The following lists the valid values the出口ession stringmay take:

激活计数：

Returns the number of times a mapping rule has been activated.

Example

下面的例子说明了几种反表达式operations.

bin.xml文件

  I’m some sort of item inside this bin. What type of item may I be? I wouldn’t know. Why should I? Ask the bin. 

地图规则.xmp

 <maprule expr=“激活计数”/>      

FME features constructed:

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Feature Type: `item' Attribute(string): `mapping-rule-activate-count' has value `1' Attribute(string): `value' has value `I'm some sort of item inside this bin.' Attribute(string): `xml_type' has value `xml_no_geom' Geometry Type: Unknown (0) =================================================================== +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Feature Type: `item' Attribute(string): `mapping-rule-activate-count' has value `2' Attribute(string): `value' has value `What type of item may I be?' Attribute(string): `xml_type' has value `xml_no_geom' Geometry Type: Unknown (0) =================================================================== +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Feature Type: `item' Attribute(string): `mapping-rule-activate-count' has value `3' Attribute(string): `value' has value `I wouldn't know.' Attribute(string): `xml_type' has value `xml_no_geom' Geometry Type: Unknown (0) =================================================================== +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Feature Type: `item' Attribute(string): `mapping-rule-activate-count' has value `4' Attribute(string): `value' has value `Why should I?' Attribute(string): `xml_type' has value `xml_no_geom' Geometry Type: Unknown (0) =================================================================== +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Feature Type: `item' Attribute(string): `mapping-rule-activate-count' has value `5' Attribute(string): `value' has value `Ask the bin.' Attribute(string): `xml_type' has value `xml_no_geom' Geometry Type: Unknown (0) ===================================================================