Load a file's contents as Apache Ant properties.  This is equivalent
to <property file|resource="..."/> except that it
supports nested <filterchain> elements.
Also if the file is missing, the build is halted with an error, rather
than a warning being printed.
Note: the default value of this
task's prefixValues attribute is different from the
default value of the same attribute in
the <property>
task.
| Attribute | Description | Required | 
| srcFile | source file | One of these or a nested resource | 
| resource | the resource name of the property file | |
| encoding | encoding to use when loading the file | No | 
| classpath | the classpath to use when looking up a resource. | No | 
| classpathref | the classpath to use when looking up a resource,
      given as reference
      to a <path>defined elsewhere.. | No | 
| prefix | Prefix to apply to loaded properties; a "." is appended to the prefix if not specified. Since Ant 1.8.1 | No | 
| prefixValues | Whether to apply the prefix when expanding the right hand side of the properties. Since Ant 1.8.2 | No (default=true) | 
The specified resource will be used as src. Since Ant 1.7
for use with the resource attribute.
<loadproperties srcFile="file.properties"/>or
    <loadproperties>
      <file file="file.properties"/>
    </loadproperties>
Load contents of file.properties as Ant properties.
    <loadproperties srcFile="file.properties">
      <filterchain>
        <linecontains>
          <contains value="import."/>
        </linecontains>
      </filterchain>
    </loadproperties>
Read the lines that contain the string "import."
from the file "file.properties" and load them as
Ant properties.
    <loadproperties>
      <gzipresource>
        <url url="http://example.org/url.properties.gz"/>
      </gzipresource>
    </loadproperties>
Load contents of http://example.org/url.properties.gz, uncompress it
on the fly and load the contents as Ant properties.