Adding modify data to dxf code

[mvsawyer]

I'm going to try and explain this the best I can so here goes:
I've got a lisp program that modifies a block with over 200 attributes. What I'd like to do is add some arbitrary DXF code to the association list of an attribute that tells the program that the attribute has been previously modified. The question here (finally) is:

Is there a DXF code that is in place for programmatic data?
Is there some other way of adding my own DXF code to the assoc list?

[mvsawyer]

Just went through help looking at DXF codes and found:

300-309-Arbitrary text strings

will this work for my purpose?

[alanjt]

XData or LData is an option.

[mvsawyer]

Please explain further? How would I use XData or LData?

[RobertB]

Please explain further? How would I use XData or LData?

XData is documented in the LISP help files.

[alanjt]

Forget LData, that's for dictionaries anyway. Sorry about that.

[dgorsman]

XDATA is probably best, but have a look into XRECORDS as well. They can be attached to the entities' extension dictionary and having them indexed with a look-up value is helpful.

[RobertB]

XDATA is probably best, but have a look into XRECORDS as well. They can be attached to the entities' extension dictionary and having them indexed with a look-up value is helpful.

Yeah, I should have mentioned that extension dictionaries are usually preferred to XData these days.

[mvsawyer]

XDATA is probably best, but have a look into XRECORDS as well. They can be attached to the entities' extension dictionary and having them indexed with a look-up value is helpful.

I want the information attached specifically to the attribute entity. My lisp modifies the attribute's justification (default is middle, modify right or left). Now I need some way of attaching data to the attribute's entity definition to show that it was modified. I'm not understanding the use of XDATA or XRECORD in conjunction with entity's association list. Is there an existing DXF code that I can set a value to without XDATA or XRECORD?

[dgorsman]

I want the information attached specifically to the attribute entity. My lisp modifies the attribute's justification (default is middle, modify right or left). Now I need some way of attaching data to the attribute's entity definition to show that it was modified. I'm not understanding the use of XDATA or XRECORD in conjunction with entity's association list. Is there an existing DXF code that I can set a value to without XDATA or XRECORD?

Not that I know of, directly anyways. XDATA and XRECORDs do just that, but handle the interfacing for you. Have a couple of read-throughs in the LISP help on both types, its laid out well.