[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: how to save an n-ary tree of nodes to and from an x ml fil
The error is caused by an extra / in the open <data> tag (<data/>0</data> should be <data>0</data>). -----Original Message----- From: Anil Philip [mailto:goodnewsforyou@y...] Sent: Monday, September 12, 2005 3:27 PM To: xml-dev@l... Subject: RE: how to save an n-ary tree of nodes to and from an x ml file? Thank you - that went thru XMLSpy - dont know why the earlier one was wrong. I tried to generate the instance file for a node (0) with 3 children (1,2,3) but xmlspy complains that "Node closing element name expected". Thanks again for your help. <?xml version="1.0" encoding="UTF-8"?> <Node xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="C:\Projects\ACD\acd_schema3.xsd"> <childNodes><Node> <childNodes></childNodes> <data>1</data> </Node><Node> <childNodes></childNodes> <data>2</data> </Node><Node> <childNodes></childNodes> <data>3</data> </Node></childNodes> <data/>0</data> </Node> --- Doug Rudder <drudder@d...> wrote: > Anil - > > Your ListOfNodes element should be a complexType (as referenced by > childNodes). Something like this might work: > > <?xml version="1.0" encoding="UTF-8"?> <xs:schema > xmlns:xs="http://www.w3.org/2001/XMLSchema" > elementFormDefault="qualified" > attributeFormDefault="unqualified"> > > <xs:complexType name="ListOfNodes"> > <xs:sequence> > <xs:element ref="Node" minOccurs="0" > maxOccurs="unbounded"/> > </xs:sequence> > </xs:complexType> > > <xs:element name="Node"> > <xs:annotation> > <xs:documentation>ACD nodes - 2. Copyright juwo LLC > 2005</xs:documentation> > </xs:annotation> > <xs:complexType> > <xs:sequence> > <xs:element name="childNodes" > type="ListOfNodes"/> > <xs:element name="data" > type="xs:string"/> > </xs:sequence> > </xs:complexType> > </xs:element> > </xs:schema> > > Doug > > -----Original Message----- > From: Anil Philip [mailto:goodnewsforyou@y...] > Sent: Monday, September 12, 2005 2:50 PM > To: xml-dev@l... > Subject: RE: how to save an n-ary tree of nodes to and from > an xml file? > > Michael, Thanks for your reply. > Yes, I removed the parent link. However I think the schema is not > correct - XML Spy complains but I cant see whats wrong: > --- > <?xml version="1.0" encoding="UTF-8"?> <xs:schema > xmlns:xs="http://www.w3.org/2001/XMLSchema" > elementFormDefault="qualified" > attributeFormDefault="unqualified"> > <xs:element name="Node"> > <xs:annotation> > <xs:documentation>ACD nodes - 2. Copyright juwo LLC > 2005</xs:documentation> > </xs:annotation> > <xs:complexType> > <xs:sequence> > <xs:element name="childNodes" > type="ListOfNodes"/> > <xs:element name="data" type="xs:string"/> > </xs:sequence> > </xs:complexType> > <xs:element name="ListOfNodes"> > <xs:complexType> > <xs:sequence> > <xs:element ref="Node" minOccurs="0" > maxOccurs="unbounded"/> > </xs:sequence> > </xs:complexType> > </xs:element> > </xs:element> > </xs:schema> > > --- Michael Kay <mike@s...> wrote: > > > > I am trying to find how to implement something > in > > XML > > > and was disappointed and surprised to find not > too many in-depth > > > tutorials or information; unlike in > > Java > > > where the Sun Java tutorial at java.sun.com is > > enough > > > to get one working productively... > > > [ok, rant over] > > > > > > --- > > > I am trying to represent a n-ary tree of nodes > in > > xml. > > > More accurately, I am trying to save/instantiate > a tree of nodes > > > to-from an xml file. > > > Am finding it difficult trying to represent the > parent-child > > > relationships. > > > > > > Java: (simplified) > > > ----- > > > > > > class Node { > > > Arraylist childNodes; > > > Node parent; > > > String data; > > > } > > > > The "parent" pointer here is redundant (you could > reconstruct it from > > other information). In my experience, when > designing XML data > > structures it's best to avoid such redundancy. All > it achieves is to > > increase the burden on senders to make the > document consistent and on > > recipients to check that it is indeed consistent. > > > > Once you eliminate the redundancy, you seem to > have a pure hierarchy, > > with a very natural XML representation: > > > > <node> > > <node> > > <data>x</data> > > </node> > > <node/> > > <node> > > <node/> > > <node> > > <data>x</data> > > <node/> > > <node/> > > </node> > > </node> > > </node> > > > > Of course, you could flatten this if you prefer so > all the nodes are > > on the same level, and the hierarchic relationship > are represented by > > id/idref attributes. But it seems more natural to > use the XML > > hierarchy to represent the information hierarchy > when you can. > > > > Michael Kay > > http://www.saxonica.com/ > > > > > > > > > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > ----------------------------------------------------------------- > The xml-dev list is sponsored by XML.org > <http://www.xml.org>, an initiative > of OASIS <http://www.oasis-open.org> > > The list archives are at > http://lists.xml.org/archives/xml-dev/ > > To subscribe or unsubscribe from this list use the > subscription > manager: > <http://www.oasis-open.org/mlmanage/index.php> > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ----------------------------------------------------------------- The xml-dev list is sponsored by XML.org <http://www.xml.org>, an initiative of OASIS <http://www.oasis-open.org> The list archives are at http://lists.xml.org/archives/xml-dev/ To subscribe or unsubscribe from this list use the subscription manager: <http://www.oasis-open.org/mlmanage/index.php>
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