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Home >Online Product Documentation >Table of Contents >Obtaining a Union Obtaining a UnionSpecify the | operator to combine collection sets. For example, the following query returns all last-name elements and all first-name elements in the current context: The result set can contain zero or more of each element that the | operator applies to. For example, using the previous query, it is possible for the query to contain only first-name elements if no last-name elements are found. The following query finds all book elements and magazine elements in the bookstore element: The next query finds all books and all authors in the current context: The next query returns the first names, last names, and degrees of authors of books or magazines in the current context:
A union can appear only as the first step in a location path expression. Consequently, the following is incorrect because there is a union specification that is not in the first step of a location path expression. The following query finds all books for which the author's first name is Bob and all magazines with prices less than 10 dollars: |
XML PRODUCTIVITY THROUGH INNOVATION ™
