• 在这个例子中,three new attributes are added to the input features:
• 已添加更新并设置为常量值“smith”。
• 添加X和Y，并通过用FME函数提取几何来设置到特征的坐标。

新的属性。的时候反映在要怎么变换r, at the top of the attribute list.

The attribute values are updated, and can be viewed in the Data Inspector’s table view.

Adjacent Feature Attributes are accessed under Advanced: Attribute Value Handling. When turned on, you can specify a number of features preceding and following the current feature to reference in calculating new values.

Suppose we are given the dataset below:

If theNumber of Prior Featuresand后续功能的数量parameters are both set to 2, then when the first feature is read, the AttributeCreator has access to the following features:

Note that some attributes are missing because no features exist prior to the first feature.

After the second feature is read, the window of prior and subsequent features available to the AttributeCreator shifts to produce the following:

This statement would calculate the average latitude of the two preceding features:

Calculations referencing adjacent features can be created in the Arithmetic Editor and the Text Editor. These editors will list the attributes of the currently processed feature first, then the prior features, then the subsequent features.

此变形器接受任何功能。

Features with the new attributes and optionally defined values.

When an AttributeCreator is opened for the first time, this area will contain a blank row where a new attribute can be created. Additional rows are added as entries are made.

Expanding the Advanced section provides access to the attributes of adjacent features that can be used to define values. While this section may appear complex, most users will rarely need this functionality.

Check “Enable Adjacent Feature Attributes” to use this feature.

You can now set an attribute value (in the Attribute Actions matrix) based on the attributes of features prior or subsequent to the current feature by referencing them as follows:

• Attributes of prior features are referenced as feature[-1].AttrName, feature[-2].AttrName, etc.
• 后续功能的属性被称为特征[+1] .attrname，功能[+2] .attrname等。
• Attributes of the currently processed feature are accessed directly without a prefix, such as AttrName.

When retrieving the value of a prior feature, any changes made by the AttributeCreator to that feature will take effect.

Number of Prior Features

This parameter specifies the maximum number of prior features that can be referenced by the AttributeCreator. If Multiple Feature Attribute Support is enabled, this must be a value from 0 to 100. As additional features must be read for each feature processed, defining only the maximum number of features needed to be retrieved will improve performance.

后续功能的数量

This parameter specifies the maximum number of subsequent features that can be referenced by the AttributeCreator. If Multiple Feature Attribute Support is enabled, this must be a value from 0 to 100. As additional features must be read for each feature processed, defining only the maximum number of features needed to be retrieved will improve performance.

替换丢失，无效，空

This parameter specifies the desired behavior when the referenced attribute does not exist, has a null value, or has an empty string value.

此类属性可以被认为是未解决的属性。例如，由于在第一个输入功能之前没有功能，因此attributecreator将无法解决第一个输入功能的特征[-1] .attrname的值。如果此参数设置为No Substitution, the AttributeCreator will resolve all unresolved attributes with an empty string.

As another example, if the value of feature[+2] is the empty string andDefault Valueis specified, then the empty string will be treated as an unresolved attribute, and will be resolved as the value specified under Default Value.

如果此参数设置为Closest Adjacent Feature，如果存在这样的功能，则未解决的属性将被解析为最近特征的相应属性。查找最近的功能时，跳过具有未解决属性的功能。

例如，如果特征[-2] .attrname的值未解析，则要解析功能的值[-2] .attrname该属性将查看最接近的功能[-2]，在此之前在功能之间交替交替并在特征[-2]之后。它将首先查看特征[-3] .attrname，然后是特征[-1] .attrname，如果需要，然后在需要的情况下要包含[-4] .attrname，直到指定的所有先前和后续功能都已耗尽。

If the attribute remains unresolved within the specified prior and subsequent features, then it will be resolved as the value specified in the Default Value parameter.

Default Value

This parameter specifies the value used to resolve unresolved attributes in these cases:

• Substitute Missing, Null and Empty by: is set toDefault Value
• Substitute Missing, Null and Empty by: is set toClosest Adjacent Feature在指定的先前和后续功能的数量内找不到值。

Using the Text Editor

const文本编辑器提供了一个方便的方法ruct text strings (including regular expressions) from various data sources, such as attributes, parameters, and constants, where the result is used directly inside a parameter.

Text Editor

Using the Arithmetic Editor

The Arithmetic Editor provides a convenient way to construct math expressions from various data sources, such as attributes, parameters, and feature functions, where the result is used directly inside a parameter.

Arithmetic Editor

Conditional Values

Set values depending on one or more test conditions that either pass or fail.

Parameter Condition Definition Dialog

内容

Expressions and strings can include a number of functions, characters, parameters, and more - whether entered directly in a parameter or constructed using one of the editors.

内容Types

String Functions	These functions manipulate and format strings.
Special Characters	文本编辑器中提供了一组控制字符。
Math Functions	两个编辑器都有数学函数。
Math Operators	These operators are available in the Arithmetic Editor.
FME Feature Functions	These return primarily feature-specific values.
System Parameters	FME and workspace-specific parameters may be used.
Working with User Parameters	创建自己的可编辑参数。

AttributeCopier

AttributeKeeper

AttributeManager

AttributeRemover

AttributeRenamer

AttributeValueMapper

bulkattributerenamer.

BulkAttributeRemover