XML: Getting value of attribute

Hello,

I am sure I should be able to figure this one out on my own,

but I don't seem to be able to find what I need....

Part of my application must read data created by devices

from a third party.  This data is provided as an XML file,

but each device, of course, uses a different schema.

I am adding support for a new device, and I am having trouble

figuring out how to extract one specific piece of information...

A simplified XML fragment looks like this:

<?xml version="1.0" encoding="UTF-16" standalone="no"?>

<DeviceData>

<Exam Eye="R">

<ExamDate>2010-08-27T14:41:15</ExamDate>

<Reading>

<Sph>-15.00</Sph>

<Cyl>1.50</Cyl>

<Axis>97</Axis>

</Reading>

</Exam>

<Exam Eye="L">

<ExamDate>2010-08-27T14:41:15</ExamDate>

<Reading>

<Sph>-15.00</Sph>

<Cyl>1.50</Cyl>

<Axis>97</Axis>

</Reading>

</Exam>

</DeviceData>

In my code, I create a DomParser, then get the root tag.

To get the exam information, I then send #getElementsByTagName: 'Exam' nameSpaceURI: '*'

to the root tag, then get the Reading information from the exam element, using the same

method.

This all works fine.

Where I need help, is finding the attribute of the Exam elements.

I can extract the readings, but I need to know if they apply to the right or left eye

(attribute = "R" or "L").

When I get the exam element from the DeviceData element, I get an instance

of AbtDOMElement.  I see that there are methods to #getAttribute:, 

but I get nil back.  And when I inspect the AbtDOMElement, the attributes

instance variable contains an instance of AbtDOMNamedNodeMap, in which 

#items is a blank LookupTable.

Have a made a fundamental mistake here on how I am getting the elements?

Or is there something I am missing about getting the attributes for an element?

Any help would be greatly appreciated.....

Thanks in advance!

Julian Ford

Hey Julian,

When you create your xml parser...try it with the following.

xmlParser := AbtXmlDOMParser newNonValidatingParser

decodingEnabled: false;

yourself.

...and let me know if that solves it.

-- Seth

On Monday, May 14, 2018 at 1:59:41 PM UTC-4, <a href="javascript:" target="_blank" gdf-obfuscated-mailto="pA8iSnQnAgAJ" rel="nofollow" onmousedown="this.href=&#39;javascript:&#39;;return true;" onclick="this.href=&#39;javascript:&#39;;return true;">rjuli...@... wrote:

Hey there, Seth!  Thanks for responding.

I sent only a tiny snippet, for the sake of illustration.

Below, I have included a contrived example which will illustrate

the issue.

The code will, of course, fail on the use of the reading information,

but when it breaks, you can inspect the examElement.

So, I just need to be able to tell WHICH exam element I am processing,

when I set the reading data.  Unfortunately, the order in which the Exam

elements show up are not guaranteed, so I cannot rely on that.

THANKS!!!

Julian

==========================

| xmlParser dom aString rootTag |

aString := '<?xml version="1.0" encoding="UTF-8"?>

<OCT>

<Exam Eye="R">

<ExamDate>2010-08-27T14:41:15</ExamDate>

<Reading>

<Sph>-15.00</Sph>

<Cyl>1.50</Cyl>

<Axis>97</Axis>

</Reading>

</Exam>

<Exam Eye="L">

<ExamDate>2010-08-27T14:41:15</ExamDate>

<Reading>

<Sph>-15.00</Sph>

<Cyl>1.50</Cyl>

<Axis>97</Axis>

</Reading>

</Exam></OCT>

'.

xmlParser := AbtXmlDOMParser new

decodingEnabled: false;

yourself.

[ dom := xmlParser parse: aString ]

when: SgmlExceptions::SgmlException do: [ :aSignal | aSignal resumeWith: #resume ].

( (rootTag := dom rootTag) notNil ) ifFalse: [ ^nil ].

(rootTag getElementsByTagName: 'Exam' nameSpaceURI: '*') do: [ :examElement |

(examElement getElementsByTagName: 'Reading' nameSpaceURI: '*') ifNotNil: [ :reading |

self setRightAutorefractorFromDomElement: reading

].

].

It would appear that this does the trick!

Thank you!!

Julian

On Monday, May 14, 2018 at 3:00:09 PM UTC-4, Seth Berman wrote:

Hey Julian,

When you create your xml parser...try it with the following.

xmlParser := AbtXmlDOMParser newNonValidatingParser

decodingEnabled: false;

yourself.

...and let me know if that solves it.

-- Seth

On Monday, May 14, 2018 at 1:59:41 PM UTC-4, [hidden email] wrote:

Hey there, Seth!  Thanks for responding.

I sent only a tiny snippet, for the sake of illustration.

Below, I have included a contrived example which will illustrate

the issue.

The code will, of course, fail on the use of the reading information,

but when it breaks, you can inspect the examElement.

So, I just need to be able to tell WHICH exam element I am processing,

when I set the reading data.  Unfortunately, the order in which the Exam

elements show up are not guaranteed, so I cannot rely on that.

THANKS!!!

Julian

==========================

| xmlParser dom aString rootTag |

aString := '<?xml version="1.0" encoding="UTF-8"?>

<OCT>

<Exam Eye="R">

<ExamDate>2010-08-27T14:41:15</ExamDate>

<Reading>

<Sph>-15.00</Sph>

<Cyl>1.50</Cyl>

<Axis>97</Axis>

</Reading>

</Exam>

<Exam Eye="L">

<ExamDate>2010-08-27T14:41:15</ExamDate>

<Reading>

<Sph>-15.00</Sph>

<Cyl>1.50</Cyl>

<Axis>97</Axis>

</Reading>

</Exam></OCT>

'.

xmlParser := AbtXmlDOMParser new

decodingEnabled: false;

yourself.

[ dom := xmlParser parse: aString ]

when: SgmlExceptions::SgmlException do: [ :aSignal | aSignal resumeWith: #resume ].

( (rootTag := dom rootTag) notNil ) ifFalse: [ ^nil ].

(rootTag getElementsByTagName: 'Exam' nameSpaceURI: '*') do: [ :examElement |

(examElement getElementsByTagName: 'Reading' nameSpaceURI: '*') ifNotNil: [ :reading |

self setRightAutorefractorFromDomElement: reading

].

].

Indeed I am!

On Monday, May 14, 2018 at 4:06:47 PM UTC-4, <a href="javascript:" target="_blank" gdf-obfuscated-mailto="mMAE8kQrAgAJ" rel="nofollow" onmousedown="this.href=&#39;javascript:&#39;;return true;" onclick="this.href=&#39;javascript:&#39;;return true;">rjuli...@... wrote:

Hey...on a completely separate topic...

Are you still planning on going to ESUG in September?

Hi Seth,


amm I right if I assume this is exactly related to this DTD thingie? I mean, if you use a validating parser, you must provide some basis to validate upon?

Joachim


Am Montag, 14. Mai 2018 21:00:09 UTC+2 schrieb Seth Berman:

Hey Julian,

When you create your xml parser...try it with the following.

xmlParser := AbtXmlDOMParser newNonValidatingParser

decodingEnabled: false;

yourself.

...and let me know if that solves it.

-- Seth

On Monday, May 14, 2018 at 1:59:41 PM UTC-4, [hidden email] wrote:

Hey there, Seth!  Thanks for responding.

I sent only a tiny snippet, for the sake of illustration.

Below, I have included a contrived example which will illustrate

the issue.

The code will, of course, fail on the use of the reading information,

but when it breaks, you can inspect the examElement.

So, I just need to be able to tell WHICH exam element I am processing,

when I set the reading data.  Unfortunately, the order in which the Exam

elements show up are not guaranteed, so I cannot rely on that.

THANKS!!!

Julian

==========================

| xmlParser dom aString rootTag |

aString := '<?xml version="1.0" encoding="UTF-8"?>

<OCT>

<Exam Eye="R">

<ExamDate>2010-08-27T14:41:15</ExamDate>

<Reading>

<Sph>-15.00</Sph>

<Cyl>1.50</Cyl>

<Axis>97</Axis>

</Reading>

</Exam>

<Exam Eye="L">

<ExamDate>2010-08-27T14:41:15</ExamDate>

<Reading>

<Sph>-15.00</Sph>

<Cyl>1.50</Cyl>

<Axis>97</Axis>

</Reading>

</Exam></OCT>

'.

xmlParser := AbtXmlDOMParser new

decodingEnabled: false;

yourself.

[ dom := xmlParser parse: aString ]

when: SgmlExceptions::SgmlException do: [ :aSignal | aSignal resumeWith: #resume ].

( (rootTag := dom rootTag) notNil ) ifFalse: [ ^nil ].

(rootTag getElementsByTagName: 'Exam' nameSpaceURI: '*') do: [ :examElement |

(examElement getElementsByTagName: 'Reading' nameSpaceURI: '*') ifNotNil: [ :reading |

self setRightAutorefractorFromDomElement: reading

].

].