Abstract: A subset of markup elements used in an electronically published document can be defined as being "significant." For example, all titled elements may be called significant elements. The structure of the document defined by only the significant elements can be determined in the same manner as the structure of the document defined by all markup elements. For example, titled elements define a table of contents. A first representation of the document structure defined by all of the markup elements may be used in combination with a second representation of the document structure defined by only the significant elements to control selection of portions of the document such that previous and subsequent portions can be selected and rendered in a consistent and intuitive manner.

Abstract: A subset of markup elements used in an electronically published document can be defined as being, "significant." For example, all titled elements may be called significant elements. The structure of the document defined by only the significant elements can be determined in the same manner as the structure of the document defined by all markup elements. For example titled elements define a table of contents. A first representation of the document structure defined by all of the markup elements may be used in combination with a second representation of the document structure defined by only the significant elements to control selection of portions of the document such that previous and subsequent portions can be selected and rendered in a consistent and intuitive manner.