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Overlapping markup
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<p>In <a href="/facts/Markup_language/WwhlNVIu">markup languages</a> and the <a href="/facts/Digital_humanities/wMSGWnw6">digital humanities</a>, overlap occurs when a document has two or more structures that interact in a non-<a href="/facts/Hierarchical/mYJyqFrG">hierarchical</a> manner. A document with overlapping markup cannot be represented as a <a href="/facts/Tree_(graph)/TCWk4Joy">tree</a>. This is also known as concurrent markup. Overlap happens, for instance, in <a href="/facts/Poetry/ylGarm6p">poetry</a>, where there may be a <a href="/facts/Meter_(poetry)/uIzxuQHA">metrical</a> structure of <a href="/facts/Foot_(prosody)/bJmBpspy">feet</a> and lines; a linguistic structure of sentences and quotations; and a physical structure of volumes and pages and editorial annotations. </p>