Open extent property handle

The function opens a property handle for the extent or extent based operation path passed in vExtentPath . The operation path may contain symbolic references to option variables (e.g. %EXT_PREF%Pers ), which are replaced before evaluating the access path by current settings of corresponding options.

As operation path, a simple property name (extent name), a property path or a path property might be passed as well in vExtentPath .

The extent property is opened with the access mode passed in eAccessMode . The access mode can be changed later on by setting the accessMode() property.

When the extent name (e.g. ImportPersons ) refers to an external file (CSV, Directory, XML etc.), an option variable with the extent name has to be defined in the ini-file, database options or application, which refers to the file location (like ImportPersons=~/data/impost/persons.csv ).