Soft Returns in Tagged Text

Question

Our Pindar AgilityCMS content managment system flows text to an InDesign page using a special PlugIn.
Some characters are stored natively (store an "a", get an "a" on the page), while other special characters are stored using Tagged Text or Unicode. A return can be either <0x000D> or \u000D. This is especially useful because we can output through one of four "channels".... InDesign, Quark, HTML or as entered in the content manager. The return can now be \p in Quark or <BR> in HTML.  A non-breaking space, for example, can be \u00A0 in the InDesign channel, &nbsp; in HTML or <\!s> in Quark. When we insert the "special character" in the Data Editor of our content system, it might be displayed as [sp], but it will resolve correctly regardless of which channel we publish to.
The problem is that unlike Quark, Adobe does not provide for a "soft return" or forced line break. Sure, you can type one from the keyboard with shift+return, and purists will argue that you'd never want to store a soft (discretionary) return in any type of tagged text or a content management system. However, all our text is set flush left, ragged right, and we frequently want to force line breaks for readability, and do so consistently.
Instead of:
On Sale Now Buy One, Get
One Free
we always want
On Sale Now
Buy One, Get One Free
Again, this is a problem whether you store your data in simple tagged text files, or if you bring it in via a complex PlugIn, as we do.
There are many, many threads on this site and elsewhere that discuss this shortcoming. Does Adobe plan to support Soft Returns in Tagged Text with some kind of special tag?

Answer 1

Your question is predicated on some false assumptions, and I'm afraid Peter, Peter, and Stix didn't quite pick that up in their replies. (This gives me pause since normally they're all very detail-oriented).
As I told you when you posted in the thread from 2009, "InDesign Tagged Text supports forced line breaks just fine."
You write:
Does Adobe plan to support Soft Returns in Tagged Text with some kind of special tag?
Adobe's import mechanism does indeed support soft returns. There's no need to speculate on Adobe's plans, which is the direction the other replies went to.
With that in mind, let's move to your actual question:
Our Pindar AgilityCMS content managment system flows text to an InDesign page using a special PlugIn. 
Some characters are stored natively (store an "a", get an "a" on the page), while other special characters are stored using Tagged Text or Unicode. A return can be either <0x000D> or \u000D. This is especially useful because we can output through one of four "channels".... InDesign, Quark, HTML or as entered in the content manager. The return can now be \p in Quark or <BR> in HTML.  A non-breaking space, for example, can be \u00A0 in the InDesign channel, &nbsp; in HTML or <\!s> in Quark. When we insert the "special character" in the Data Editor of our content system, it might be displayed as [sp], but it will resolve correctly regardless of which channel we publish to.
I think you need to address this question to your support channel for Pindar AgilityCMS. Indeed, in IDTT <000A> represents a shift-return. Here's a screenshot of a test textframe:
and when exported to InDesign Tagged Text, it produces:
<ASCII-MAC>
<Version:7><FeatureSet:InDesign-Roman><ColorTable:=<Black:COLOR:CMYK:Process:0,0,0,1>>
<DefineParaStyle:NormalParagraphStyle=<Nextstyle:NormalParagraphStyle>>
<ParaStyle:NormalParagraphStyle>Paragraph one
<ParaStyle:NormalParagraphStyle>Paragraph two<0x000A>P2/Line two
I presume you have tried <0x000A> as discussed in the prior thread.
I suppose it's remotely possible this is a Mac/PC issue, because the two operating systems do you different line break characters.
Anyhow, once again, your criticism of InDesign and Adobe is false and unfair. And if you have a problem with a 3rd party plugin, those are really the people you need to talk to.
Still, it might be wise to get it working with plain File > Place. Try testing my above IDTT file. Or exporting your own from a sample textframe like the one I used.