EDOBE XDOM PMML Uživatelský manuál stáhnout pdf (Strana 20)

INFRASTRUCTURE JAVA CLASSES

Some important classes for storing and exchanging information are

XTProps for storing property information and XTMetaData for storing

column metadata. The classes discussed in later sections use these to

communicate information.

XML Property

Objects

The XTProps class provides a flexible data structure for storing name/

value pairs, with the additional capability of elements having child

elements. This corresponds to the

XTProps element in our XML.

The parties using the properties must agree on how to interpret the

items. Methods are available to get and set properties, and to read

and write the properties as XML.

Column Meta-

Data

Column metadata consists of column name, type, role, and additional

information depending on the column type. Continuous columns

have a mean, min, max, standard deviation, row count, and missing

value count. Categorical columns have category labels and counts.

The column name, type, and role information can be gathered before

all of the data has been read. The other summaries are only available

once the node has been executed.

This information is stored in an

XTMetaData object. This class has

methods for getting and setting metadata values, and reading and

writing the metadata as XML.

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EDOBE XDOM PMML Uživatelský manuál Strana 20