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- To: "Roger L. Costello" <costello@mitre.org>,"XML Developers List" <xml-dev@lists.xml.org>
- Subject: RE: [xml-dev] What is a Compound Document?
- From: "Dare Obasanjo" <dareo@microsoft.com>
- Date: Fri, 28 Jan 2005 08:21:03 -0800
- Thread-index: AcUFE5an4l6TesOGSuyQo55wzX98hgAOPzCQAAIX0hA=
- Thread-topic: [xml-dev] What is a Compound Document?
I don't think schema validation has much to do with the notion of
compound documents. Compound documents are about combining elements from
multiple vocabularies yet preserving the semantics from each vocabulary
in a way that allows one to fit together the parts to make a coherrent
whole. The classic example is embedding MathML in XHTML. Whether xs:any
is used to specify extension points or not is'nt the tricky bit or even
the interesting bit about compound documents.
--
PITHY WORDS OF WISDOM
The buddy system is essential to your survival; it gives the enemy
somebody else to shoot at.
-----Original Message-----
From: Roger L. Costello [mailto:costello@mitre.org]
Sent: Friday, January 28, 2005 7:59 AM
To: 'XML Developers List'
Subject: [xml-dev] What is a Compound Document?
Hi Folks,
I am still unclear on what a compound document is.
1. What is a compound document?
A compound document is an XML document comprised of elements from
independently developed schemas. For example, an XML document that is
comprised of elements from the SVG schema and elements from the XHTML
schema is a compound document.
2. How is this different from an instance document that conforms to an
XML Schema that uses the <any/> element ?
Suppose that my Book schema uses an <any/> element after the declaration
for
Title:
targetNamespace="http://www.books.org";
<element name="Book">
<complexType>
<sequence>
<element name="Title" type="string"/>
<any namespace="##other"/>
<element name="Author" type="string"/>
<element name="Date" type="string"/>
<element name="ISBN" type="string"/>
<element name="Publisher" type="string"/>
</sequence>
</complexType>
</element>
This declaration of Book states that "After the Title element you can
have any element from any other namespace".
So, an XML document could thus contain elements from the book namespace
and the XHTML namespace:
<Book xmlns="http://www.books.org";>
<Title>The First and Last Freedom</Title>
<HTML xmlns="http://www.w3.org/TR/REC-xhtml";>
<BODY>Hello World</BODY>
</HTML>
<Author>J. Krishnamurti</Author>
<Date>1954</Date>
<ISBN>0-06-064831-7</ISBN>
<Publisher>Harper & Row</Publisher> </Book>
Is this a compound document? It meets the above definition, i.e., the
instance document is comprised of elements from independently developed
schemas and namespaces.
I am guessing that it is not a compound document. True?
I am guessing that a compound document entails more than simply an
instance document comprised of elements from multiple vocabularies.
I am guessing that if the Book schema were declared without the <any/>
element, e.g.,
targetNamespace="http://www.books.org";
<element name="Book">
<complexType>
<sequence>
<element name="Title" type="string"/>
<element name="Author" type="string"/>
<element name="Date" type="string"/>
<element name="ISBN" type="string"/>
<element name="Publisher" type="string"/>
</sequence>
</complexType>
</element>
And an instance document inserted an XHTML element after the Title
element:
<Book xmlns="http://www.books.org";>
<Title>The First and Last Freedom</Title>
<HTML xmlns="http://www.w3.org/TR/REC-xhtml";>
<BODY>Hello World</BODY>
</HTML>
<Author>J. Krishnamurti</Author>
<Date>1954</Date>
<ISBN>0-06-064831-7</ISBN>
<Publisher>Harper & Row</Publisher> </Book>
Then this instance document is a compound document. Is this true?
If so, then by definition a compound document cannot be validated by an
XML Schema validator. Correct? For example, an XML Schema validator
would reject the above instance document, saying "invalid element after
Title, expecting Author".
So, what is a compound document?
/Roger
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