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In markup languages, overlap occurs when a document has two or more structures that interact in a non-hierarchical manner. A document with overlapping markup cannot be represented as a tree. This is also known as concurrent markup. Overlap happens, for instance, in poetry, where there may be a metrical structure of feet and lines; a linguistic structure of sentences and quotations; and a physical structure of volumes and pages and editorial annotations. == Properties and types == A distinction should be drawn between schemes that allow non-contiguous overlap, and those which allow only contiguous overlap; often, what is meant by 'markup overlap' is strictly the latter. Contiguous overlap can always be represented as a linear document with milestones, without the need for fragmentation and pointers to fragments, but non-contiguous overlap may require document fragmentation. Another distinction in overlapping markup schemes is whether elements can overlap with other elements of the same kind (''self-overlap''). A scheme may have a ''privileged'' hierarchy. Some XML-based schemes, for example, represent one hierarchy directly in the XML document tree, and represent other, overlapping, structures by another means; these are said to be ''non-privileged''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Overlapping markup」の詳細全文を読む スポンサード リンク
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