How do I define that the contents of an element should be unique only in
a sub-tree of the whole XML file?
In my case, I have several documents, each containing several files. The
file names have to be unique only within each document. I.e., the
following is valid:
<doc>
<file>AAA</file>
<file>BBB</file>
</doc>
<doc>
<file>AAA</file>
</doc>
, while the following is not:
<doc>
<file>AAA</file>
<file>BBB</file>
<file>AAA</file> <!-- Matches previous file! -->
</doc>
--
Victor 3 1867
Victor Engmark wrote: How do I define that the contents of an element should be unique only in a sub-tree of the whole XML file?
In my case, I have several documents, each containing several files. The file names have to be unique only within each document. I.e., the following is valid: <doc> <file>AAA</file> <file>BBB</file> </doc> <doc> <file>AAA</file> </doc>
, while the following is not: <doc> <file>AAA</file> <file>BBB</file> <file>AAA</file> <!-- Matches previous file! --> </doc>
XML schema allows for uniqueness constraints, here is an example schema
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="root">
<xs:complexType >
<xs:sequence>
<xs:element ref="doc" maxOccurs="unbo unded" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="doc">
<xs:complexType >
<xs:sequence>
<xs:element name="file" type="xs:string " maxOccurs="unbo unded" />
</xs:sequence>
</xs:complexType>
<xs:unique name="uniqueFil e">
<xs:selector xpath="file" />
<xs:field xpath="." />
</xs:unique>
</xs:element>
</xs:schema>
and an example document
<?xml version="1.0" encoding="UTF-8"?>
<root xmlns:xsi="http ://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespace SchemaLocation= "test20040430Xs d.xml">
<doc>
<file>AAA</file>
<file>BBB</file>
</doc>
<doc>
<file>AAA</file>
<file>AAA</file>
</doc>
</root>
where the validation will flag an error for the second <file> element in
the second <doc> element.
--
Martin Honnen http://JavaScript.FAQTs.com/
Martin Honnen wrote:
Victor Engmark wrote:
How do I define that the contents of an element should be unique only in a sub-tree of the whole XML file?
In my case, I have several documents, each containing several files. The file names have to be unique only within each document. I.e., the following is valid: <doc> <file>AAA</file> <file>BBB</file> </doc> <doc> <file>AAA</file> </doc>
, while the following is not: <doc> <file>AAA</file> <file>BBB</file> <file>AAA</file> <!-- Matches previous file! --> </doc>
XML schema allows for uniqueness constraints, here is an example schema
<?xml version="1.0" encoding="UTF-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="root"> <xs:complexType > <xs:sequence> <xs:element ref="doc" maxOccurs="unbo unded" /> </xs:sequence> </xs:complexType> </xs:element>
<xs:element name="doc"> <xs:complexType > <xs:sequence> <xs:element name="file" type="xs:string " maxOccurs="unbo unded" /> </xs:sequence> </xs:complexType> <xs:unique name="uniqueFil e"> <xs:selector xpath="file" /> <xs:field xpath="." /> </xs:unique> </xs:element>
</xs:schema>
and an example document
<?xml version="1.0" encoding="UTF-8"?> <root xmlns:xsi="http ://www.w3.org/2001/XMLSchema-instance" xsi:noNamespace SchemaLocation= "test20040430Xs d.xml"> <doc> <file>AAA</file> <file>BBB</file> </doc> <doc> <file>AAA</file> <file>AAA</file> </doc> </root>
where the validation will flag an error for the second <file> element in the second <doc> element.
I tried this, but I have obviously overlooked something, because the
file http://vengmark.home.cern.ch/vengmar...ples/input.xml is
valid according to http://vengmark.home.cern.ch/vengmar...amples/moi.xsd, even though
none of the ID elements are unique. Sorry the example is verbose...
--
Victor
Victor Engmark wrote: I tried this, but I have obviously overlooked something, because the file http://vengmark.home.cern.ch/vengmar...ples/input.xml is valid according to http://vengmark.home.cern.ch/vengmar...amples/moi.xsd, even though none of the ID elements are unique. Sorry the example is verbose...
Disregard the previous message; I had got the scope of the unique
element wrong. Nevertheless, XML Spy v5 is unable to generate even
simplistic valid files of the new Schema document. Does anyone know a
tool with which I can generate "good" sample documents from Schemas? It
should give at least some control over the values entered into fields,
and shouldn't use several hundred MBs to generate a few MBs of XML...
--
Victor This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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