This XML Schema allows to validate either complete VDL scripts, or specific VDL chunks. describe a tranformation or derivation with metadata. describe the mapping data towards a transformation provides the unique identifier for a definition. defines the three basic containers for parameters. defines the usage of a logical filename. defines the legal namespaces of execution profiles. defines the permissable range for version numbers. defines the permissable range for namespace identifiers. "text" or "lfn" are permissable outside a TR. A logical filename. name="LFNType" DEPRECATED! Will be removed soon. Pure text. "text" or "use" are permissable inside a TR. References a bound variable. name="UseType" The default is a single space. Pure text. A simple element for text or files. A simple element for text or files. A list element containing simple elements. A simple element for text or logical filenames. A generic metadata encapsulation. A "transformation" describes the specification of process environment with placeholders A "transformation" describes the specification of process environment with placeholders Each parameter is declared using the "declare" element, specifying the name and container type. Optional default value. A list of simple scalars. A command line argument spec consists of an arbitrary number of namable chunks. Like an anonymous "derivation" element, allows to call other transformations from within a compound. The "pass" element established the binding between an actual parameter with its named formal counterpart. A list of simple elements. Each "profile" element declares one DAGMan, Condor, VDS, or Unix environment variable. Please note that the default is a single space. A "derivation" contains actual parameters. This element must occur, even if the list is empty. A "derivation" makes use of previous or outside transformations, and fills the placeholders with specific values. The "pass" element established the binding between an actual parameter with its named formal counterpart. The virtual data modification language. A VDL document consists of any number of "transformation" and "derivation" elements in arbitrary order.