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<?xml version="1.0" encoding="UTF-8"?>

<library xmlns:dc="http://purl.org/dc/elements/1.1/">
    <book id="b001" category="fiction" lang="en">
        <title>The Great Gatsby</title>
        <author>F. Scott Fitzgerald</author>
        <year>1925</year>
        <price>12.99</price>
        <dc:subject>American literature</dc:subject>
    </book>
    <book id="b002" category="non-fiction" lang="en">
        <title>Clean Code</title>
        <author>Robert C. Martin</author>
        <year>2008</year>
        <price>35.00</price>
    </book>
    <magazine id="m001" category="tech">
        <title>Linux Journal</title>
        <year>2024</year>
    </magazine>
</library>

<!--
    XPath Expressions (results annotated):

/library                    → root <library> element
    /library/book               → both <book> elements
    //title                     → all <title> elements (book + magazine)
    //book[@category='fiction']         → b001 only
    //book[year > 2000]                 → b002 only
    //book[@category='fiction']/title   → <title>The Great Gatsby</title>
    /library/*                          → book, book, magazine
    /library/book[1]                    → first book (b001)
    /library/book[last()]               → last book (b002)
    /library/book/@id                   → b001, b002 (attribute nodes)
    count(//book)                       → 2
    sum(//price)                        → 47.99
    //book[not(@lang)]                  → none (both have lang)
    /library/book[position() <= 2]      → b001, b002
    //title[contains(text(),'Code')]    → Clean Code
-->