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1.9. Inline Elements
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# 2. Types

- 2.1. Overview
- 2.2. Schema

## 2.1. Overview

1
The xstructural package provides a simple checker for type attributes. Given a file of type declarations, the checker will ensure that all type attributes that appear in a document refer to declared types. If a type attribute refers to a nonexistent type, the document will fail to validate.

### 2.1.2. Example

    <Types xmlns="urn:com.io7m.structural.types:1:0">
      <Type Name="package">
        <Description xml:lang="en">
          A name of a software package.
        </Description>
        <Description xml:lang="fr">
          Le nom d'un logiciel de service.
        </Description>
        <Description xml:lang="de">
          Ein Name eines Softwarepakets.
        </Description>
      </Type>
    </Types>

## 2.2. Schema

1
A type declaration file must conform to the following schema:

### 2.2.2. Type Declaration Schema

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

    <!--
      Copyright © 2025 Mark Raynsford <code@io7m.com> https://www.io7m.com

      Permission to use, copy, modify, and/or distribute this software for any
      purpose with or without fee is hereby granted, provided that the above
      copyright notice and this permission notice appear in all copies.

      THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
      SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
      IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    -->

    <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
                elementFormDefault="qualified"
                xmlns:t="urn:com.io7m.structural.types:1:0"
                targetNamespace="urn:com.io7m.structural.types:1:0">

      <xsd:import namespace="http://www.w3.org/XML/1998/namespace"
                  schemaLocation="xml.xsd"/>

      <xsd:simpleType name="VersionNameType">
        <xsd:annotation>
          <xsd:documentation xml:lang="en">
            The type of package (semantic) versions.
          </xsd:documentation>
        </xsd:annotation>
        <xsd:restriction base="xsd:string">
          <xsd:pattern value="([0-9]{1,8})\.([0-9]{1,8})\.([0-9]{1,8})"/>
        </xsd:restriction>
      </xsd:simpleType>

      <xsd:simpleType name="PackageNameType">
        <xsd:annotation>
          <xsd:documentation xml:lang="en">
            The type of package names.
          </xsd:documentation>
        </xsd:annotation>
        <xsd:restriction base="xsd:string">
          <xsd:pattern value="([a-z][a-z0-9_-]{0,63})(\.[a-z][a-z0-9_-]{0,62}){0,15}"/>
        </xsd:restriction>
      </xsd:simpleType>

      <xsd:simpleType name="TypeNameType">
        <xsd:annotation>
          <xsd:documentation xml:lang="en">
            The type of type names. Type names are used to categorize elements and
            are somewhat analogous to CSS classes, except that they are intended to
            be used for more than just styling documents.
          </xsd:documentation>
        </xsd:annotation>
        <xsd:restriction base="xsd:string">
          <xsd:pattern value="[a-zA-Z][a-zA-Z0-9_\.\-]*"/>
        </xsd:restriction>
      </xsd:simpleType>

      <xsd:complexType name="DescriptionType"
                       mixed="true">
        <xsd:annotation>
          <xsd:documentation xml:lang="en">
            A human-readable description of the meaning of a type.
          </xsd:documentation>
        </xsd:annotation>
        <xsd:attribute ref="xml:lang"
                       use="required"/>
      </xsd:complexType>

      <xsd:element name="Description"
                   type="t:DescriptionType"/>

      <xsd:element name="Type">
        <xsd:complexType>
          <xsd:annotation>
            <xsd:documentation xml:lang="en">
              The type of types.
            </xsd:documentation>
          </xsd:annotation>

          <xsd:sequence>
            <xsd:sequence minOccurs="1"
                          maxOccurs="unbounded">
              <xsd:element ref="t:Description"/>
            </xsd:sequence>
          </xsd:sequence>

          <xsd:attribute ref="xml:base"/>
          <xsd:attribute type="t:TypeNameType"
                         name="Name"
                         use="required"/>
        </xsd:complexType>

        <xsd:unique name="LanguageUnique">
          <xsd:selector xpath="t:Description"/>
          <xsd:field xpath="@xml:lang"/>
        </xsd:unique>
      </xsd:element>

      <xsd:element name="Types">
        <xsd:complexType>
          <xsd:sequence>
            <xsd:sequence minOccurs="0"
                          maxOccurs="unbounded">
              <xsd:choice>
                <xsd:element ref="t:Types"/>
                <xsd:element ref="t:Type"/>
              </xsd:choice>
            </xsd:sequence>
          </xsd:sequence>

          <xsd:attribute ref="xml:base"/>
        </xsd:complexType>

        <xsd:key name="TypeNameUnique">
          <xsd:selector xpath=".//t:Type"/>
          <xsd:field xpath="@Name"/>
        </xsd:key>
      </xsd:element>

    </xsd:schema>

1.9. Inline Elements
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io7m | single-page | multi-page | epub | xstructural 2.1.0