1<?xml version="1.0" encoding="UTF-8"?>
2<element name="cross_sections" xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
3  <interleave>
4    <zeroOrMore>
5      <element name="library">
6        <interleave>
7          <choice>
8            <element name="materials">
9              <data type="string"/>
10            </element>
11            <attribute name="materials">
12              <data type="string"/>
13            </attribute>
14          </choice>
15          <choice>
16            <element name="type">
17              <data type="string"/>
18            </element>
19            <attribute name="type">
20              <data type="string"/>
21            </attribute>
22          </choice>
23          <choice>
24            <element name="path">
25              <data type="string"/>
26            </element>
27            <attribute name="path">
28              <data type="string"/>
29            </attribute>
30          </choice>
31        </interleave>
32      </element>
33    </zeroOrMore>
34    <optional>
35      <element name="directory">
36        <data type="string">
37          <param name="maxLength">255</param>
38        </data>
39      </element>
40    </optional>
41  </interleave>
42</element>
43