Why One Sentence Turns Into Ten Segments in an IDML File¶

A sentence that reads as one line of copy in InDesign can arrive in a CAT tool as a string of short fragments, each asking for a separate translation. The surprise usually comes from treating the page as if it were the source file’s structure: a layout can make several underlying text events look like one sentence, or one continuous sentence look like several distinct pieces.

IDML segmentation in a CAT tool sits at the intersection of three things: the text structure saved in the IDML package, the file filter that imports that structure, and the CAT tool’s language segmentation rules. Those layers can produce similar-looking fragments for different reasons. The right fix depends on which layer created the split.

A translator who merges every visible fragment may hide the real problem, create tag or layout issues, and make later review harder. A short diagnosis first can tell you whether the file needs a source edit, a filter adjustment, or a segmentation-rule change.

What IDML stores, and what a CAT tool segments¶

IDML is an XML representation of an InDesign document. The IDML file-format specification describes a package of separate XML components, with story content stored under Stories and layout information and shared resources represented elsewhere in the package. The specification mirror is version 8.0, corresponding to InDesign CS6 in 2012, so it explains the package structure rather than the behavior of every current CAT tool (IDML File Format Specification).

A CAT tool doesn’t simply turn every visible text line into one translation segment. The importer reads the package and applies its own rules to determine which parts should appear as translatable units. Language segmentation then works on that imported text. A split in the editor can therefore reflect an actual paragraph boundary, a sentence boundary detected by the tool, or the way that tool’s file filter handles formatting and other structural information.

The IDML story model is useful because it separates text from the runs that carry formatting. A story can contain ParagraphStyleRange, CharacterStyleRange, and Content structures. Literal text sits in Content; style ranges carry formatting information (IDML Reference: Story structure).

Those names can sound as though each range corresponds to one paragraph or one sentence. They don’t. A CharacterStyleRange represents a run of characters with shared attributes. One sentence can pass through several such runs, and a single paragraph can contain more than one character style. A ParagraphStyleRange begins when paragraph attributes change, so counting those ranges doesn’t necessarily tell you how many visible paragraphs the story contains.

The key distinction is between a structure present in the source and a segment boundary exposed by the CAT tool. A change in character attributes creates a new CharacterStyleRange, which marks a formatting boundary in the story. Whether the importer displays that boundary as a separate segment depends on its handling of the file and its parsing rules. The XML structure alone doesn’t prove that the CAT tool will create one segment per style run.

For example, a product sentence might begin in regular text, put the product name in bold, then return to regular text before its full stop. In InDesign, the sentence reads normally. In the story, the character formatting changes create separate runs. The CAT editor might show those formatting changes as inline tags in one segment, or present the text in another form. The result depends on the importer.

An Adobe Community discussion describes an IDML-to-XLIFF-to-memoQ workflow and reports that bold and italic formatting tags can affect how translators apply formatting in the CAT editor (discussion of translating IDML with a CAT tool). The report is workflow-specific, but it illustrates why a tag is not necessarily a word, a sentence boundary, or an error. Some tags carry formatting information that needs to survive translation.

A useful working definition: an IDML segment is a unit presented by a particular CAT tool for translation; it isn’t a direct synonym for a sentence, a paragraph, or an XML range.

That distinction matters when a file shows many short segments. The visible count can point you toward a cause, but it cannot identify the cause by itself. You need to inspect both the story structure and the way the chosen importer presents it.

Three boundaries that can split one apparent sentence¶

The most useful first step is to separate paragraph marks, forced line breaks, and language segmentation. Each can divide text in the editor, but each describes a different event.

In the IDML story model, a paragraph mark and a forced line break are not interchangeable. A paragraph mark is represented by a Br element. It ends a paragraph. A forced line break is represented by U+2028 inside Content; it moves text to a new visual line while the paragraph continues. A tab is U+0009 inside Content, rather than a separate tab element (IDML Reference: Story structure).

The IDML reference puts the distinction plainly: “A paragraph ends where a
mark stands; a forced line break is the character U+2028 inside Content; a tab is the tab character U+0009.”

That distinction changes the diagnosis. A line that looks like a soft wrap on the page may actually be a paragraph ending in the source. Conversely, a forced line break can move text to a new visual line without creating a new paragraph. The page view alone won’t tell you which event the file contains.

A true paragraph mark can split a sentence before the CAT tool applies its sentence rules. Imagine that a designer inserts returns to arrange a short headline across several lines. If those returns are paragraph marks, the story contains several paragraph boundaries even if the punctuation and visual design suggest a single sentence. The translator then sees separate units because the source structure says the text is divided.

Language segmentation is a separate layer. CAT tool segmentation rules are language-processing rules that look for sentence patterns, often using regular expressions and patterns before and after a break. A full stop doesn’t always mean a sentence has ended: abbreviations, initials, and other punctuation contexts can complicate the decision. Documentation for a specific tool and version matters when adjusting those rules.

Some CAT systems use abbreviation resources as an exception mechanism for period-based sentence breaks. That means punctuation by itself isn’t always enough to explain a boundary. If a tool splits after an abbreviation, the file filter may have imported the text correctly while the language rules have interpreted the period as a sentence ending.

Formatting adds another possible source of confusion, but it shouldn’t be mistaken for a guaranteed segmentation cause. A character-style change creates a new run in the IDML story. A CAT tool can represent the change as a tag inside a segment, or handle it differently. If a sentence is split exactly where bold or italic formatting begins, inspect the importer’s treatment of those runs before assuming that the style change itself must split every CAT segment.

A tab can also affect how text appears in the editor without acting as a paragraph mark. In the described story model, a tab is U+0009 within Content. Lists, label-value pairs, and carefully aligned copy may rely on tabs. A tag-heavy segment with a tab in it can look structurally complicated, but the tab alone doesn’t establish that the sentence has ended.

The practical question is not just “Where does the CAT tool split?” Ask “What does the source contain at that position, and what layer decides to display the boundary?” That question keeps a formatting run, a paragraph ending, and a sentence rule from being treated as the same thing.

How to diagnose the split before changing anything¶

A useful diagnosis compares three views: the page in InDesign, the source story in the IDML package, and the bilingual file or editor view produced by the CAT tool. Each view answers a different question. The page shows what a reader sees; the story shows what the source stores; the CAT view shows how the importer and segmentation rules interpret it.

Start with a sentence that splits unexpectedly. Record the fragments in order and note where each boundary appears relative to punctuation, a line break, and a change in formatting. Don’t merge the segments yet. A boundary at a full stop suggests one possible route; a boundary in the middle of a word or phrase points to a different one.

Next, inspect the relevant story content. An IDML file is a ZIP package containing separate XML components, including story files under Stories, as described in the IDML File Format Specification. The story model lets you look for Br marks, U+2028 line breaks, and changes in CharacterStyleRange (IDML Reference: Story structure).

Use the following sequence:

1. Match the text to its story. Find the sentence in the story content rather than relying only on its position on the page. The package separates stories from other document components, so the page’s appearance doesn’t identify the precise story structure by itself.
2. Check for Br at each CAT segment boundary. A Br mark ends a paragraph in the described IDML model. If it appears where the CAT tool splits, the source has an actual paragraph boundary.
3. Check for U+2028 where a visual line changes. U+2028 represents a forced line break inside Content, so the paragraph continues even though the line changes on the page.
4. Inspect character-style runs. A new CharacterStyleRange can mark a change in character attributes. Note whether the boundary lines up with a formatting change, but don’t assume the run itself creates a CAT segment.
5. Compare the same passage in the CAT editor and bilingual export. If the story has no paragraph mark at the split, check whether punctuation, the file filter, or formatting treatment explains the editor’s boundary.
6. Test one change at a time. Change the likely source or project setting on a copy and re-import the file. One controlled test makes it easier to tell which change affected the segments.

A small example makes the comparison clearer. Suppose the page shows the line “Enter your details to continue.” as a single sentence. The CAT tool presents “Enter your details” and “to continue.” as separate segments. If a Br appears between the phrases, the source structure offers a direct explanation: the sentence crosses an actual paragraph boundary. If U+2028 appears instead, the paragraph continues, and the tool’s treatment of that character becomes relevant. If neither appears, punctuation rules or importer behavior need closer attention.

A second case can look similar but have a different cause. Consider a sentence with one bold term and one italic phrase, with no paragraph mark inside it. The story may contain several CharacterStyleRange runs. If the CAT editor displays tags around those phrases but keeps the sentence as one segment, the style changes are being preserved without dividing the segment. If the tool splits the sentence, inspect its file filter and project settings rather than treating the style run as proof of a source paragraph break.

Keep the test file small. A short excerpt containing one example of each suspected boundary is easier to compare than a full publication. Preserve the original IDML and use a copy for experiments. That way, a change to source structure or a project setting doesn’t obscure what the original file contained.

The IDML reference also describes a paragraph model in which a new ParagraphStyleRange begins when paragraph attributes change; multiple paragraphs with the same style may be represented within a range and separated by paragraph marks (IDML Reference: The paragraph model). Consequently, counting paragraph-style ranges is not a reliable substitute for inspecting the marks between pieces of text.

Don’t infer a cause from the number of segments alone. Ten segments can result from several real paragraph marks, language segmentation around punctuation, or importer behavior. A segment count doesn’t reveal which one happened.

Fix the cause, not the symptom¶

The right fix depends on what the diagnosis found. A source-level paragraph mark, a sentence rule, and a formatting run call for different actions. Applying the same merge operation to all three can make the editor look tidier while leaving the actual issue untouched.

When a designer inserted true paragraph marks to control visual wrapping, correct the source structure if the layout permits it. Replace paragraph endings used only for line layout with a suitable forced line break or another design treatment, then export the IDML again and test the result. A forced line break keeps the paragraph going; a paragraph mark ends it. The IDML story reference documents the distinction, but a source edit still needs a layout check because the change can affect how the text flows.

When a split comes from language segmentation, review the relevant rules and exception resources for the language and CAT tool in use. A period after an abbreviation can be mistaken for the end of a sentence if the rule set doesn’t account for that pattern. Adjusting a rule may help when it applies to the project, but test the change on representative text: a rule that prevents one unwanted split can also affect other sentence boundaries.

When style changes appear near a split, inspect the file filter and the editor’s tag display. Inline formatting tags can belong to a single translatable segment. Keeping the text together while preserving its formatting may be better than removing the tags, especially if the translated file must retain bold, italic, or other character attributes. The Adobe Community description of an IDML-to-XLIFF-to-memoQ workflow is a reminder that formatting behavior can depend on the chosen route (discussion of translating IDML with a CAT tool).

A project-level merge can be a workaround in some CAT tool workflows, but it isn’t a universal instruction. A participant in a historical CAT tool community discussion recommended enabling source editing and merging segments across paragraphs for a particular workflow. The discussion also warned that merging many segments can take time and introduce errors, and the original poster noted that IDML’s XML structure complicates simple regular-expression cleanup of apparent line returns. Those reports describe a specific discussion, not a setting that every CAT tool offers or handles the same way.

In the Adobe Community discussion of IDML-to-XLIFF translation, a user describes formatting tags such as bold and italic affecting what translators can apply in the CAT editor.

The practical lesson is to preserve the connection between text and its formatting metadata. Removing or flattening tags may change how the translated content maps back to InDesign. A cleaner-looking translation editor isn’t necessarily a safer file-preparation result.

Before merging across a paragraph break, check what the boundary means in the source and what the CAT tool will write back. The paragraph mark may carry a structural purpose, such as separating text that must remain in distinct paragraphs. Merging can be appropriate when the source contains a layout-only return and the workflow supports the resulting structure, but it can also combine content that should remain separate.

A safe test has four parts:

• Keep an untouched copy of the original IDML.
• Apply the proposed source or project change to a test copy.
• Translate a short excerpt that includes the boundary and any relevant formatting.
• Reopen or otherwise verify the resulting IDML in the intended InDesign workflow.

The last step matters because a successful import into the CAT tool doesn’t by itself prove that the translated content will return to the intended structure. Check paragraph separation, line breaks, and inline formatting in the result rather than judging only by the bilingual editor.

Common mistakes when handling IDML segments¶

The most damaging mistakes come from assigning meaning to a boundary before checking the source. A break in the CAT editor looks simple, but the same visual symptom can point to different structures and settings.

Mistake: treating every visual line break as a paragraph ending. A line can end because of a forced line break represented by U+2028, while the paragraph continues. A Br mark ends the paragraph. Compare the marker in the story rather than assuming the page’s line layout tells you which one is present (IDML Reference: Story structure).

Mistake: treating every character-style change as a sentence boundary. A bold term or italic phrase can start a new CharacterStyleRange without ending the sentence. The range marks formatting, and the CAT tool’s importer decides how to expose it. Look for tags and formatting behavior before changing segmentation settings.

Mistake: counting XML ranges as if they were paragraphs. ParagraphStyleRange and CharacterStyleRange describe style runs, not a simple one-element-per-visible-paragraph or one-element-per-sentence map. Multiple same-style paragraphs can occur within a range, separated by paragraph marks. Read the structure around the text rather than counting element names.

Mistake: changing the segmentation rules to solve a source problem. A CAT tool’s language rules can split text according to punctuation, but they don’t remove paragraph marks from the IDML story. If a Br sits between two fragments, changing a sentence rule may not address the actual source boundary.

Mistake: cleaning XML with a broad search-and-replace. A simple text replacement can’t reliably distinguish paragraph marks from forced line breaks, formatting runs, and other story content. A practitioner discussion has specifically described IDML’s XML structure as a complication for simple regular-expression cleanup of apparent line returns. Treat automated edits as a controlled test, not as a safe universal repair.

Mistake: merging every short segment by hand. One reported workflow recommends merging across paragraphs as a project-level workaround, but the same discussion notes that merging many segments can be time-consuming and error-prone. A bulk merge can also hide whether the source contains intentional paragraph divisions. Diagnose a representative sample first and verify how the result maps back.

Mistake: assuming every visible tag is ordinary translatable text. Formatting tags can represent bold or italic text. Other kinds of hidden or index-related content may also appear as inline tags in a CAT editor. A tag can carry structure or metadata rather than words that belong in the translation. Check the filter’s documentation and the editor’s tag behavior before deleting or moving it.

A project handoff should record the cause and the chosen remedy. If the source contains actual paragraph marks used for layout, say so. If a language rule splits after an abbreviation, identify the rule or exception being tested. If formatting tags are involved, note whether the CAT tool keeps them inline or presents them another way. That short record helps another translator distinguish an intentional source structure from a recurring import problem.

A useful preflight note can include the story name, the text surrounding the boundary, the observed marker, the CAT tool and file-filter settings checked, and the result of a test import. Avoid recording only “segments need merging.” That description says what the editor looks like, not why it happened.

For teams, the clearest handoff separates source corrections from project settings. A designer can correct an inappropriate paragraph mark in the InDesign source; a project manager can review the CAT tool’s language rules; a translator can report how formatting tags appear in the editor. Each role then has a specific question to answer rather than a vague request to “fix the segmentation.”

FAQ¶

Why does one sentence become multiple segments in an IDML CAT tool?¶

A real paragraph mark in the IDML story, a CAT tool’s language segmentation rules, or the file filter’s handling of formatting can split what looks like one sentence. Compare the boundary in the editor with the story structure to see which layer is involved.

Do character styles split CAT tool segments in IDML?¶

A change in character attributes creates a new CharacterStyleRange, but that formatting boundary doesn’t automatically become a CAT tool segment. The importer and its parsing rules determine whether the editor keeps it as an inline tag or presents it differently.

What is the difference between an IDML paragraph break and a forced line break?¶

A paragraph mark is represented by a Br element and ends the paragraph. A forced line break is U+2028 inside Content; it moves text to a new visual line while the paragraph continues (IDML Reference: Story structure).

How can I prevent manual line breaks from creating too many IDML segments?¶

First find out whether the source contains Br paragraph marks or U+2028 forced line breaks. If paragraph marks were inserted only to control visual wrapping, correct the source structure where appropriate, export a new IDML, and test the import. Check the layout after the change.

Can I merge IDML segments across paragraph breaks in a CAT tool?¶

Some CAT tool workflows offer project-level merging across paragraphs, but the option and its effects vary. A historical community discussion reports that approach for a particular workflow and warns that merging many segments can be time-consuming and error-prone. Verify the current tool behavior and the returned InDesign structure before using it.