ant/proposal/myrmidon/src/manifest/core-ant-descriptor.xml

<ant-lib>

  <types>

    <!-- basic tasks/datatypes/coverters required in most environments -->
    <task name="log" classname="org.apache.antlib.core.Log" />
    <task name="fail" classname="org.apache.antlib.core.Fail" />
    <task name="property" classname="org.apache.antlib.core.Property" />
    <task name="load-properties" classname="org.apache.antlib.core.LoadProperties" />

  </types>

  <converters>

    <converter classname="org.apache.antlib.core.StringToEnumConverter"
               source="java.lang.String"
               destination="org.apache.avalon.framework.Enum" />
    <converter classname="org.apache.antlib.core.StringToFileConverter"
               source="java.lang.String"
               destination="java.io.File" />
    <converter classname="org.apache.antlib.core.StringToBooleanConverter"
               source="java.lang.String"
               destination="java.lang.Boolean" />
    <converter classname="org.apache.antlib.core.StringToLongConverter"
               source="java.lang.String"
               destination="java.lang.Long" />
    <converter classname="org.apache.antlib.core.StringToIntegerConverter"
               source="java.lang.String"
               destination="java.lang.Integer" />
    <converter classname="org.apache.antlib.core.StringToShortConverter"
               source="java.lang.String"
               destination="java.lang.Short" />
    <converter classname="org.apache.antlib.core.StringToByteConverter"
               source="java.lang.String"
               destination="java.lang.Byte" />
    <converter classname="org.apache.antlib.core.StringToDoubleConverter"
               source="java.lang.String"
               destination="java.lang.Double" />
    <converter classname="org.apache.antlib.core.StringToFloatConverter"
               source="java.lang.String"
               destination="java.lang.Float" />
    <converter classname="org.apache.antlib.core.StringToClassConverter"
               source="java.lang.String"
               destination="java.lang.Class" />
    <converter classname="org.apache.antlib.core.StringToURLConverter"
               source="java.lang.String"
               destination="java.net.URL" />

  </converters>

</ant-lib>