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If two documents contain identical strings, that match alone cannot tell you which document came first or which one is original. It establishes only that the text compared matched under the representation and rules used—not who created it, when it was created, or how it was handled.

What an identical string match establishes

A string comparison answers a narrow question: do these text sequences match according to a specified comparison rule? For web text, character encoding and the sequence of characters matter. The W3C’s Character Model for the World Wide Web: String Matching recommends comparing text in a common digital representation, ordinarily Unicode code points.

That result is not a finding about authorship or chronology. The W3C guidance defines how text can be compared; it does not determine document provenance. A text match therefore cannot, by itself, identify an original.

Why the comparison rule matters

Use a common character representation

Text may be encoded or represented in different ways. Before comparing it, a system should convert the text to a common Unicode representation. The result still depends on what text was extracted and compared: matching extracted text is not the same as matching every byte of two files.

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Elebase USB to USB C Adapter for iPhone 18 Pro Max,USBC Car Charger Adapter
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Choose whether case and Unicode normalization count

String matching can use different rules, including no normalization, ASCII case folding, Unicode canonical case folding, or Unicode compatibility case folding. For identifiers and syntactic content, the W3C recommendation is generally to use no case folding and no Unicode normalization. Other choices apply only where the vocabulary and intended comparison justify them.

Compatibility normalization deserves particular care: the W3C warns it can alter meaning, appearance, or processing and may make matches too permissive. A comparison that treats more strings as equivalent may be useful for a particular task, but it answers a broader equivalence question—not which document is authentic.

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What to record when reporting a match

To make a string-match result understandable, state what was compared and which rules were applied. For example, specify whether the comparison used extracted text or another representation, whether it was case-sensitive, and whether Unicode normalization was applied. Without those details, “the strings match” does not fully describe the test.

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What the match cannot establish

A matching string does not show which file is the original, which was copied, or whether both came from another source. The cited W3C material does not assess metadata, signatures, timestamps, version history, or custody. Those are separate kinds of evidence; string equality does not resolve them.

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Anker USB C Hub, 5-in-1 USBC to HDMI Splitter with 4K Display
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