Problems Reading XML File

[John Bowman]

Hi All,

I'm fairly new to XML, so I presume I'm doing something obviously dense
here, but here it goes. Below is an XML file that was extracted from a test
Windows Installer .MSP (patch) file using the MsiExtractPatch XMLData()
method and directly written to disk as a test. On the surface, it seems to
me to be valid XML since IE can load & display it.

<MsiPatch xmlns="http://www.microsoft.c om/msi/patch_applicabi lity.xsd"
SchemaVersion=" 1.0.0.0" PatchGUID="{2AA C52C8-0F60-481F-852D-116CDE7EBE0D}"
MinMsiVersion=" 3">
<TargetProduc t MinMsiVersion=" 200">
<TargetProductC ode
Validate="true" >{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<TargetVersio n Validate="true" ComparisonType= "LessThanOrEqua l"
ComparisonFilte r="MajorMinorUp date">1.00.0000 </TargetVersion>
<TargetLangua ge Validate="false ">1033</TargetLanguage>
<UpdatedLanguag es>1033</UpdatedLanguage s>
<UpgradeCode
Validate="true" >{1C18A718-D408-4D74-B2C6-0F6A932CE841}</UpgradeCode>
</TargetProduct>
<TargetProductC ode>{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<SequenceData >
<PatchFamily>C2 E2F15571DD458A9 66B3C231CFB5E7D </PatchFamily>
<Sequence>0.0.1 7219.55500</Sequence>
<Attributes>0 </Attributes>
</SequenceData>
</MsiPatch>

Now that I can actually "see" the XML for testing purposes I want to extract
some information from it, but it always fails to get anything. For example,
what's funtionally wrong with the following code? It throws an exception:
"Object reference not set to an instance of an object." when it hits the
MessageBox.Show line. When I check the LocalName of xRoot, it correctly
shows "MsiPatch", but fails to get the xTargetProductN ode, or any other
nodes below the root node. Using SelectNodes to get an XmlNodeList doesn't
work either. The only way I can seem to get the info is by looping through
the ChildNodes (and comparing their LocalNames to the tag I'm looking for)
instead of directly with a simple XPath. What am I doing wrong?

if(File.Exists( FileSpec) == true)
{
XmlDocument xDoc = new XmlDocument();
xDoc.Load(DEF_O UTPUT_FILENAME) ;
XmlNode xRoot = xDoc.DocumentEl ement;
XmlNode xTargetProductN ode = xRoot.SelectSin gleNode("Target Product");
//XmlNodeList xNodeList = xRoot.SelectNod es("TargetProdu ct"); ///Also fails
to find anything and the xNodeList.Count = 0;
MessageBox.Show (xTargetProduct Node.LocalName) ;
}
else
{
MessageBox.Show ("Unable to read file:" +
Environment.New Line +
FileSpec);
}
Thanks in advance for the help,

--
John C. Bowman
Software Engineer
Thermo Electron Scientific Instruments Div.
<Remove this before reply> jo*********@the rmo.com

[jsh02_nova]

John,
Where's the declaration line? You go to have '<?xml version="1.0"
encoding="UTF-8"?>' at least, on the first line of the xml file to make it
for a valid.

thx
-jsh

"John Bowman jo*********@the rmo.com>" wrote:

Hi All,

I'm fairly new to XML, so I presume I'm doing something obviously dense
here, but here it goes. Below is an XML file that was extracted from a test
Windows Installer .MSP (patch) file using the MsiExtractPatch XMLData()
method and directly written to disk as a test. On the surface, it seems to
me to be valid XML since IE can load & display it.

<MsiPatch xmlns="http://www.microsoft.c om/msi/patch_applicabi lity.xsd"
SchemaVersion=" 1.0.0.0" PatchGUID="{2AA C52C8-0F60-481F-852D-116CDE7EBE0D}"
MinMsiVersion=" 3">
<TargetProduc t MinMsiVersion=" 200">
<TargetProductC ode
Validate="true" >{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<TargetVersio n Validate="true" ComparisonType= "LessThanOrEqua l"
ComparisonFilte r="MajorMinorUp date">1.00.0000 </TargetVersion>
<TargetLangua ge Validate="false ">1033</TargetLanguage>
<UpdatedLanguag es>1033</UpdatedLanguage s>
<UpgradeCode
Validate="true" >{1C18A718-D408-4D74-B2C6-0F6A932CE841}</UpgradeCode>
</TargetProduct>
<TargetProductC ode>{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<SequenceData >
<PatchFamily>C2 E2F15571DD458A9 66B3C231CFB5E7D </PatchFamily>
<Sequence>0.0.1 7219.55500</Sequence>
<Attributes>0 </Attributes>
</SequenceData>
</MsiPatch>

Now that I can actually "see" the XML for testing purposes I want to extract
some information from it, but it always fails to get anything. For example,
what's funtionally wrong with the following code? It throws an exception:
"Object reference not set to an instance of an object." when it hits the
MessageBox.Show line. When I check the LocalName of xRoot, it correctly
shows "MsiPatch", but fails to get the xTargetProductN ode, or any other
nodes below the root node. Using SelectNodes to get an XmlNodeList doesn't
work either. The only way I can seem to get the info is by looping through
the ChildNodes (and comparing their LocalNames to the tag I'm looking for)
instead of directly with a simple XPath. What am I doing wrong?

if(File.Exists( FileSpec) == true)
{
XmlDocument xDoc = new XmlDocument();
xDoc.Load(DEF_O UTPUT_FILENAME) ;
XmlNode xRoot = xDoc.DocumentEl ement;
XmlNode xTargetProductN ode = xRoot.SelectSin gleNode("Target Product");
//XmlNodeList xNodeList = xRoot.SelectNod es("TargetProdu ct"); ///Also fails
to find anything and the xNodeList.Count = 0;
MessageBox.Show (xTargetProduct Node.LocalName) ;
}
else
{
MessageBox.Show ("Unable to read file:" +
Environment.New Line +
FileSpec);
}
Thanks in advance for the help,

--
John C. Bowman
Software Engineer
Thermo Electron Scientific Instruments Div.
<Remove this before reply> jo*********@the rmo.com

[Scott M.]

I'm not so sure about that. The line is certainly preferable, but a
well-formed XML document doesn't have to have that line.
"js********@hot mail.com" <js************ *****@discussio ns.microsoft.co m>
wrote in message news:F0******** *************** ***********@mic rosoft.com...

John,
Where's the declaration line? You go to have '<?xml version="1.0"
encoding="UTF-8"?>' at least, on the first line of the xml file to make it
for a valid.

thx
-jsh

"John Bowman jo*********@the rmo.com>" wrote:

Hi All,

I'm fairly new to XML, so I presume I'm doing something obviously dense
here, but here it goes. Below is an XML file that was extracted from a
test
Windows Installer .MSP (patch) file using the MsiExtractPatch XMLData()
method and directly written to disk as a test. On the surface, it seems
to
me to be valid XML since IE can load & display it.

<MsiPatch xmlns="http://www.microsoft.c om/msi/patch_applicabi lity.xsd"
SchemaVersion=" 1.0.0.0"
PatchGUID="{2AA C52C8-0F60-481F-852D-116CDE7EBE0D}"
MinMsiVersion=" 3">
<TargetProduc t MinMsiVersion=" 200">
<TargetProductC ode
Validate="true" >{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<TargetVersio n Validate="true" ComparisonType= "LessThanOrEqua l"
ComparisonFilte r="MajorMinorUp date">1.00.0000 </TargetVersion>
<TargetLangua ge Validate="false ">1033</TargetLanguage>
<UpdatedLanguag es>1033</UpdatedLanguage s>
<UpgradeCode
Validate="true" >{1C18A718-D408-4D74-B2C6-0F6A932CE841}</UpgradeCode>
</TargetProduct>

<TargetProductC ode>{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<SequenceData >
<PatchFamily>C2 E2F15571DD458A9 66B3C231CFB5E7D </PatchFamily>
<Sequence>0.0.1 7219.55500</Sequence>
<Attributes>0 </Attributes>
</SequenceData>
</MsiPatch>

Now that I can actually "see" the XML for testing purposes I want to
extract
some information from it, but it always fails to get anything. For
example,
what's funtionally wrong with the following code? It throws an exception:
"Object reference not set to an instance of an object." when it hits the
MessageBox.Show line. When I check the LocalName of xRoot, it correctly
shows "MsiPatch", but fails to get the xTargetProductN ode, or any other
nodes below the root node. Using SelectNodes to get an XmlNodeList
doesn't
work either. The only way I can seem to get the info is by looping
through
the ChildNodes (and comparing their LocalNames to the tag I'm looking
for)
instead of directly with a simple XPath. What am I doing wrong?

if(File.Exists( FileSpec) == true)
{
XmlDocument xDoc = new XmlDocument();
xDoc.Load(DEF_O UTPUT_FILENAME) ;
XmlNode xRoot = xDoc.DocumentEl ement;
XmlNode xTargetProductN ode = xRoot.SelectSin gleNode("Target Product");
//XmlNodeList xNodeList = xRoot.SelectNod es("TargetProdu ct"); ///Also
fails
to find anything and the xNodeList.Count = 0;
MessageBox.Show (xTargetProduct Node.LocalName) ;
}
else
{
MessageBox.Show ("Unable to read file:" +
Environment.New Line +
FileSpec);
}
Thanks in advance for the help,

--
John C. Bowman
Software Engineer
Thermo Electron Scientific Instruments Div.
<Remove this before reply> jo*********@the rmo.com

[Martin Honnen]

John Bowman < wrote:

<MsiPatch xmlns="http://www.microsoft.c om/msi/patch_applicabi lity.xsd"
SchemaVersion=" 1.0.0.0" PatchGUID="{2AA C52C8-0F60-481F-852D-116CDE7EBE0D}"
MinMsiVersion=" 3">
<TargetProduc t MinMsiVersion=" 200"> Now that I can actually "see" the XML for testing purposes I want to extract
some information from it, but it always fails to get anything. F if(File.Exists( FileSpec) == true)
{
XmlDocument xDoc = new XmlDocument();
xDoc.Load(DEF_O UTPUT_FILENAME) ;
XmlNode xRoot = xDoc.DocumentEl ement;
XmlNode xTargetProductN ode = xRoot.SelectSin gleNode("Target Product");

The super XPath FAQ, finding elements in the default namespace:
<http://www.faqts.com/knowledge_base/view.phtml/aid/34022/fid/616>
--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[John Bowman]

Scott,

I think I have to agree with you on this one. I did not create the XML, MS
did via the API call. Simply writing the text to a disk file, as is,
resulted in the XML I posted. I just couldn't figure out how to get it to
retreive the requested node(s) correctly. Based on the Martin's reply (see
next thread message), I think I'll be able to solve it when I implement
handling the namespace using an XmlNamespaceMan ager.

Thanks,

John

"Scott M." <s-***@nospam.nosp am> wrote in message
news:ep******** ******@TK2MSFTN GP09.phx.gbl...

I'm not so sure about that. The line is certainly preferable, but a
well-formed XML document doesn't have to have that line.
"js********@hot mail.com" <js************ *****@discussio ns.microsoft.co m>
wrote in message
news:F0******** *************** ***********@mic rosoft.com...

John,
Where's the declaration line? You go to have '<?xml version="1.0"
encoding="UTF-8"?>' at least, on the first line of the xml file to make
it
for a valid.

thx
-jsh

"John Bowman jo*********@the rmo.com>" wrote:

Hi All,

I'm fairly new to XML, so I presume I'm doing something obviously dense
here, but here it goes. Below is an XML file that was extracted from a
test
Windows Installer .MSP (patch) file using the MsiExtractPatch XMLData()
method and directly written to disk as a test. On the surface, it seems
to
me to be valid XML since IE can load & display it.

<MsiPatch xmlns="http://www.microsoft.c om/msi/patch_applicabi lity.xsd"
SchemaVersion=" 1.0.0.0"
PatchGUID="{2AA C52C8-0F60-481F-852D-116CDE7EBE0D}"
MinMsiVersion=" 3">
<TargetProduc t MinMsiVersion=" 200">
<TargetProductC ode
Validate="true" >{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<TargetVersio n Validate="true" ComparisonType= "LessThanOrEqua l"
ComparisonFilte r="MajorMinorUp date">1.00.0000 </TargetVersion>
<TargetLangua ge Validate="false ">1033</TargetLanguage>
<UpdatedLanguag es>1033</UpdatedLanguage s>
<UpgradeCode
Validate="true" >{1C18A718-D408-4D74-B2C6-0F6A932CE841}</UpgradeCode>
</TargetProduct>

<TargetProductC ode>{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<SequenceData >
<PatchFamily>C2 E2F15571DD458A9 66B3C231CFB5E7D </PatchFamily>
<Sequence>0.0.1 7219.55500</Sequence>
<Attributes>0 </Attributes>
</SequenceData>
</MsiPatch>

Now that I can actually "see" the XML for testing purposes I want to
extract
some information from it, but it always fails to get anything. For
example,
what's funtionally wrong with the following code? It throws an
exception:
"Object reference not set to an instance of an object." when it hits the
MessageBox.Show line. When I check the LocalName of xRoot, it correctly
shows "MsiPatch", but fails to get the xTargetProductN ode, or any other
nodes below the root node. Using SelectNodes to get an XmlNodeList
doesn't
work either. The only way I can seem to get the info is by looping
through
the ChildNodes (and comparing their LocalNames to the tag I'm looking
for)
instead of directly with a simple XPath. What am I doing wrong?

if(File.Exists( FileSpec) == true)
{
XmlDocument xDoc = new XmlDocument();
xDoc.Load(DEF_O UTPUT_FILENAME) ;
XmlNode xRoot = xDoc.DocumentEl ement;
XmlNode xTargetProductN ode = xRoot.SelectSin gleNode("Target Product");
//XmlNodeList xNodeList = xRoot.SelectNod es("TargetProdu ct"); ///Also
fails
to find anything and the xNodeList.Count = 0;
MessageBox.Show (xTargetProduct Node.LocalName) ;
}
else
{
MessageBox.Show ("Unable to read file:" +
Environment.New Line +
FileSpec);
}
Thanks in advance for the help,

--
John C. Bowman
Software Engineer
Thermo Electron Scientific Instruments Div.
<Remove this before reply> jo*********@the rmo.com

[John Bowman]

Martin, et al,

Thanks for the help. I think this link appears to contain the solution.

John

"Martin Honnen" <ma*******@yaho o.de> wrote in message
news:e%******** ********@TK2MSF TNGP09.phx.gbl. ..

John Bowman < wrote:

<MsiPatch xmlns="http://www.microsoft.c om/msi/patch_applicabi lity.xsd"
SchemaVersion=" 1.0.0.0"
PatchGUID="{2AA C52C8-0F60-481F-852D-116CDE7EBE0D}" MinMsiVersion=" 3">
<TargetProduc t MinMsiVersion=" 200">

Now that I can actually "see" the XML for testing purposes I want to
extract some information from it, but it always fails to get anything. F

if(File.Exists( FileSpec) == true)
{
XmlDocument xDoc = new XmlDocument();
xDoc.Load(DEF_O UTPUT_FILENAME) ;
XmlNode xRoot = xDoc.DocumentEl ement;
XmlNode xTargetProductN ode = xRoot.SelectSin gleNode("Target Product");

The super XPath FAQ, finding elements in the default namespace:
<http://www.faqts.com/knowledge_base/view.phtml/aid/34022/fid/616>
--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[KDOR]

Hi,

I think your problem can be solved by using an XmlNamespaceMan ager on your
calls to SelectSingleNod e and SelectNodes
Even when the nodes you are searching for are in the default namespace, you
still need a prefix, and whenever you use a prefix in an XPath expression,
you need an XmlNamespaceMan ager.
(See class XmlNamespaceMan ager.AddNamespa ce in VS help for a description)

XmlNamespaceMan ager nsmgr = new XmlNamespaceMan ager(xDoc .NameTable);
// Create a namespace manager
nsmgr.AddNamesp ace("default", http://www.microsoft.com/msi/patch);
// Add the default namespace with a prefix of "default"; could be any
character string e.g. "aa"

XmlNode xTargetProductN ode =
xRoot.SelectSin gleNode("defaul t:TargetProduct ", nsmgr); // Use the
prefix in the XPath expression and pass the namespace manager
XmlNodeList xNodeList = xRoot.SelectNod es("default:Tar getProduct",
nsmgr); // Use the prefix in the XPath expression and
pass the namespace manager

Regards
"John Bowman jo*********@the rmo.com>" <<Remove this before reply> wrote in
message news:u$******** *****@TK2MSFTNG P14.phx.gbl...

Hi All,

I'm fairly new to XML, so I presume I'm doing something obviously dense
here, but here it goes. Below is an XML file that was extracted from a
test Windows Installer .MSP (patch) file using the
MsiExtractPatch XMLData() method and directly written to disk as a test. On
the surface, it seems to me to be valid XML since IE can load & display
it.

<MsiPatch xmlns="http://www.microsoft.c om/msi/patch_applicabi lity.xsd"
SchemaVersion=" 1.0.0.0" PatchGUID="{2AA C52C8-0F60-481F-852D-116CDE7EBE0D}"
MinMsiVersion=" 3">
<TargetProduc t MinMsiVersion=" 200">
<TargetProductC ode
Validate="true" >{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<TargetVersio n Validate="true" ComparisonType= "LessThanOrEqua l"
ComparisonFilte r="MajorMinorUp date">1.00.0000 </TargetVersion>
<TargetLangua ge Validate="false ">1033</TargetLanguage>
<UpdatedLanguag es>1033</UpdatedLanguage s>
<UpgradeCode
Validate="true" >{1C18A718-D408-4D74-B2C6-0F6A932CE841}</UpgradeCode>
</TargetProduct>

<TargetProductC ode>{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<SequenceData >
<PatchFamily>C2 E2F15571DD458A9 66B3C231CFB5E7D </PatchFamily>
<Sequence>0.0.1 7219.55500</Sequence>
<Attributes>0 </Attributes>
</SequenceData>
</MsiPatch>

Now that I can actually "see" the XML for testing purposes I want to
extract some information from it, but it always fails to get anything. For
example, what's funtionally wrong with the following code? It throws an
exception: "Object reference not set to an instance of an object." when it
hits the MessageBox.Show line. When I check the LocalName of xRoot, it
correctly shows "MsiPatch", but fails to get the xTargetProductN ode, or
any other nodes below the root node. Using SelectNodes to get an
XmlNodeList doesn't work either. The only way I can seem to get the info
is by looping through the ChildNodes (and comparing their LocalNames to
the tag I'm looking for) instead of directly with a simple XPath. What am
I doing wrong?

if(File.Exists( FileSpec) == true)
{
XmlDocument xDoc = new XmlDocument();
xDoc.Load(DEF_O UTPUT_FILENAME) ;
XmlNode xRoot = xDoc.DocumentEl ement;
XmlNode xTargetProductN ode = xRoot.SelectSin gleNode("Target Product");
//XmlNodeList xNodeList = xRoot.SelectNod es("TargetProdu ct"); ///Also
fails to find anything and the xNodeList.Count = 0;
MessageBox.Show (xTargetProduct Node.LocalName) ;
}
else
{
MessageBox.Show ("Unable to read file:" +
Environment.New Line +
FileSpec);
}
Thanks in advance for the help,

--
John C. Bowman
Software Engineer
Thermo Electron Scientific Instruments Div.
<Remove this before reply> jo*********@the rmo.com

[John Bowman]

KDOR,

Thanks. Between your help & Martin's before you, I managed to make it work.

Take care,

John
"KDOR" <KD**@newsgroup s.nospam> wrote in message
news:OK******** ******@TK2MSFTN GP12.phx.gbl...

Hi,

I think your problem can be solved by using an XmlNamespaceMan ager on your
calls to SelectSingleNod e and SelectNodes
Even when the nodes you are searching for are in the default namespace,
you still need a prefix, and whenever you use a prefix in an XPath
expression, you need an XmlNamespaceMan ager.
(See class XmlNamespaceMan ager.AddNamespa ce in VS help for a description)

XmlNamespaceMan ager nsmgr = new XmlNamespaceMan ager(xDoc .NameTable);
// Create a namespace manager
nsmgr.AddNamesp ace("default", http://www.microsoft.com/msi/patch); //
Add the default namespace with a prefix of "default"; could be any
character string e.g. "aa"

XmlNode xTargetProductN ode =
xRoot.SelectSin gleNode("defaul t:TargetProduct ", nsmgr); // Use the
prefix in the XPath expression and pass the namespace manager
XmlNodeList xNodeList = xRoot.SelectNod es("default:Tar getProduct",
nsmgr); // Use the prefix in the XPath expression
and pass the namespace manager

Regards
"John Bowman jo*********@the rmo.com>" <<Remove this before reply> wrote in
message news:u$******** *****@TK2MSFTNG P14.phx.gbl...

Hi All,

I'm fairly new to XML, so I presume I'm doing something obviously dense
here, but here it goes. Below is an XML file that was extracted from a
test Windows Installer .MSP (patch) file using the
MsiExtractPatch XMLData() method and directly written to disk as a test.
On the surface, it seems to me to be valid XML since IE can load &
display it.

<MsiPatch xmlns="http://www.microsoft.c om/msi/patch_applicabi lity.xsd"
SchemaVersion=" 1.0.0.0"
PatchGUID="{2AA C52C8-0F60-481F-852D-116CDE7EBE0D}" MinMsiVersion=" 3">
<TargetProduc t MinMsiVersion=" 200">
<TargetProductC ode
Validate="true" >{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<TargetVersio n Validate="true" ComparisonType= "LessThanOrEqua l"
ComparisonFilte r="MajorMinorUp date">1.00.0000 </TargetVersion>
<TargetLangua ge Validate="false ">1033</TargetLanguage>
<UpdatedLanguag es>1033</UpdatedLanguage s>
<UpgradeCode
Validate="true" >{1C18A718-D408-4D74-B2C6-0F6A932CE841}</UpgradeCode>
</TargetProduct>

<TargetProductC ode>{C2E2F155-71DD-458A-966B-3C231CFB5E7D}</TargetProductCo de>
<SequenceData >
<PatchFamily>C2 E2F15571DD458A9 66B3C231CFB5E7D </PatchFamily>
<Sequence>0.0.1 7219.55500</Sequence>
<Attributes>0 </Attributes>
</SequenceData>
</MsiPatch>

Now that I can actually "see" the XML for testing purposes I want to
extract some information from it, but it always fails to get anything.
For example, what's funtionally wrong with the following code? It throws
an exception: "Object reference not set to an instance of an object."
when it hits the MessageBox.Show line. When I check the LocalName of
xRoot, it correctly shows "MsiPatch", but fails to get the
xTargetProductN ode, or any other nodes below the root node. Using
SelectNodes to get an XmlNodeList doesn't work either. The only way I can
seem to get the info is by looping through the ChildNodes (and comparing
their LocalNames to the tag I'm looking for) instead of directly with a
simple XPath. What am I doing wrong?

if(File.Exists( FileSpec) == true)
{
XmlDocument xDoc = new XmlDocument();
xDoc.Load(DEF_O UTPUT_FILENAME) ;
XmlNode xRoot = xDoc.DocumentEl ement;
XmlNode xTargetProductN ode = xRoot.SelectSin gleNode("Target Product");
//XmlNodeList xNodeList = xRoot.SelectNod es("TargetProdu ct"); ///Also
fails to find anything and the xNodeList.Count = 0;
MessageBox.Show (xTargetProduct Node.LocalName) ;
}
else
{
MessageBox.Show ("Unable to read file:" +
Environment.New Line +
FileSpec);
}
Thanks in advance for the help,

--
John C. Bowman
Software Engineer
Thermo Electron Scientific Instruments Div.
<Remove this before reply> jo*********@the rmo.com