NX Nastran DMAP Programmer's Guide - Kxcad.net

740
3.1 NDDL Summary
The NDDL (NX Nastran Data Definition Language) has several purposes:
1. The NDDL describes the hierarchical data structure of the NX Nastran
database.
2. The NDDL provides the mechanism, in conjunction with the TYPE DMAP
statement, for determining which NX Nastran generated data blocks or
parameters or both will be stored on the database.
3. The NDDL provides the schema necessary for representing the data block
data structure.
4. The NDDL and its associated query language provides the means for
selecting from the hierarchical database structure specific data blocks in the
form of flat tables, thus admitting them to relational database manipulation.
5. The NDDL provides the necessary data dependencies for automatic
modified restarts.
Descriptions of NDDL Statements
DATABLK Define a data block’s name, path, and location and describe its
contents.
DEPEN Define a data block, parameter, or virtual parameter to be
dependent upon other data block(s), parameter(s) or virtual
parameter(s).
PARAM Define a parameter’s name, type, path, location, and default value.
PATH List the QUALifiers to be used in accessing the data block or
parameter via the NDDL.
QUAL Define a qualifier’s name, type and default value