Liquid Technologies - XML Glossary
DTD / Data Types / DTD PCDATA
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    DTD PCDATA
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    In a Document Type Definition (DTD) an element can contain #PCDATA.

    PCDATA in this context means mixed content, elements may contain character data, optionally interspersed with child elements.

    Sample PCDATA Usage within a DTD
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    <!ELEMENT b (#PCDATA)>
    
    Sample XML
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    <b>character data</b>
    

    The element b may contain character data, and nothing else.

    If used correctly in conjunction with other element types it can allow the element to contain mixed content.

    Sample PCDATA Usage within a DTD
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    <!ELEMENT c (#PCDATA|d|e)*>
    
    Sample XML
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    <c>character data <d/> more text <d/> and more <e/></c>
    

    However PCDATA is not the semantic term for character data, and must appear as the first item within a 0-n choice.

    The EBNF shows these limitations.DTD ELEMENT

    [51]   Mixed               ::=       '(' S? '#PCDATA' (S? '|' S? Name)* S? ')*'
    | '(' S? '#PCDATA' S? ')'
    The PCDATA type can NOT be used within an attribute definition
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