dtd option

The dtd option enables Relaxer to generate a DTD instance from a resource specified by a parameter.

parameter

The dtd option takes no parameters. Specifying the dtd option indicates that you want Relaxer to generate a DTD.

Artifacts

The dtd option generates a DTD instance from the resource specified by the parameter.

Example1

You can get a DTD schema from a RELAX NG schema using Relaxer.

List 27.2.3.1[dtdRng.rng] is a RELAX NG schema.

<grammar xmlns="http://relaxng.org/ns/structure/1.0"
         datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
  <start>
    <ref name="account"/>
  </start>
  <define name="account">
    <element name="account">
      <attribute name="accountNo">
        <data type="token"/>
      </attribute>
      <element name="balance">
        <data type="int"/>
      </element>
      <element name="owner">
        <data type="token"/>
      </element>
      <optional>
        <ref name="address"/>
      </optional>
      <zeroOrMore>
        <ref name="phone"/>
      </zeroOrMore>
    </element>
  </define>
  <define name="address">
    <element name="address">
      <attribute name="zip">
        <data type="token"/>
      </attribute>
      <text/>
    </element>
  </define>
  <define name="phone">
    <element name="phone">
      <attribute name="area">
        <data type="token"/>
      </attribute>
      <data type="token"/>
    </element>
  </define>
</grammar>

To generate a DTD with Relaxer, enter the following command:

$ relaxer -dtd dtdRng.rng

As a result, Relaxer generates one file:

• dtdRng.dtd

The artifact file from the DTD generator is shown in List 27.2.3.2[dtdRng.dtd].

<!-- Generated by Relaxer 1.0rc3b -->
<!-- Sun Aug 10 05:49:46 GMT+09:00 2003 -->

<!ELEMENT phone (#PCDATA)>
<!ATTLIST phone area CDATA #REQUIRED>

<!ELEMENT balance (#PCDATA)>

<!ELEMENT account (balance, owner, address?, phone*)>
<!ATTLIST account accountNo CDATA #REQUIRED>

<!ELEMENT owner (#PCDATA)>

<!ELEMENT address (#PCDATA)>
<!ATTLIST address zip CDATA #REQUIRED>

Example2

You can also get a DTD schema from an XML document using Relaxer.

List 27.2.4.1[dtdXml.xml] is a sample XML document.

<account accountNo="12345">
  <balance>102030</balance>
  <owner>XML Taro</owner>
  <address zip="213">Yokohama</address>
  <phone area="123">456-7890</phone>
  <phone area="090">123-4567</phone>
</account>

To generate a DTD with Relaxer, enter the following command:

$ relaxer -dtd dtdXml.xml

As a result, Relaxer generates one file:

• dtdXml.dtd

The artifact file from the DTD generator is shown in List 27.2.4.2[dtdXml.dtd].

<!-- Generated by Relaxer 1.0rc3b -->
<!-- Sun Aug 10 05:50:03 GMT+09:00 2003 -->

<!ELEMENT phone (#PCDATA)>
<!ATTLIST phone area CDATA #REQUIRED>

<!ELEMENT balance (#PCDATA)>

<!ELEMENT account (balance, owner, address, phone+)>
<!ATTLIST account accountNo CDATA #REQUIRED>

<!ELEMENT owner (#PCDATA)>

<!ELEMENT address (#PCDATA)>
<!ATTLIST address zip CDATA #REQUIRED>