RDF Mark doesn't influence Sweep and Sweep removes all, why?

Зажигин Александр

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May 1, 2009, 8:56:59 AM5/1/09

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I have created below RDF in memory:

<?xml version="1.0"?>
<RDF:RDF xmlns:NC="http://home.netscape.com/NC-rdf#"
xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<RDF:Seq RDF:about="urn:root">
<RDF:li RDF:resource="urn:root:base_1"/>
<RDF:li RDF:resource="urn:root:base_2"/>
<RDF:li RDF:resource="urn:root:base_3"/>
</RDF:Seq>
<RDF:Description RDF:about="urn:root:base_2"
NC:id="2"
NC:name="10002" />
<RDF:Description RDF:about="urn:root:base_3"
NC:id="3"
NC:name="10003" />
<RDF:Description RDF:about="urn:root:base_1"
NC:id="1"
NC:name="10001" />
</RDF:RDF>

... and trying to Mark one and Sweep:

ds.QueryInterface(Components.interfaces.nsIRDFPurgeableDataSource);
ds.Mark(rdf.GetResource("urn:root:base_1"),
rdf.GetResource("http://home.netscape.com/NC-rdf#name"),
rdf.GetLiteral("1001"), true);
ds.Sweep();

... and it remove whole document. The result is:

<?xml version="1.0"?>
<RDF:RDF xmlns:NC="http://home.netscape.com/NC-rdf#"
xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
</RDF:RDF>

... what is wrong?

Alexander.

Axel Hecht

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May 1, 2009, 12:32:02 PM5/1/09

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No idea, can you create an xpcshell test for that?

Axel

us...@domain.invalid

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May 1, 2009, 4:18:27 PM5/1/09

to

>
> No idea, can you create an xpcshell test for that?
>
> Axel

This is the sctipt:

http://zazhigin.ru/testMarkSweep.js

And this is the output of the script:

<?xml version="1.0"?>
<RDF:RDF xmlns:NC="http://home.netscape.com/NC-rdf#"
xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">

<RDF:Description RDF:about="urn:root">

It was Marked only here -> "urn:root:chapter1" and I was expecting that
it will be removed by Sweep. And also I was expecting that
"urn:root:chapter2" container will stay, because this doesn't Mark.

Alexander.

Axel Hecht

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May 1, 2009, 5:21:36 PM5/1/09

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This seems to be the expected output of Sweep.

I slightly modified your data to make the RDF validator happy (default
namespace), and the arc that you Mark is preserved.

I'll comment on your original post in a sec.

Axel

PS: Data that I looked at on http://www.w3.org/RDF/Validator/ :

<?xml version="1.0"?> <RDF:RDF xmlns="urn:mystuff#"
xmlns:NC="http://home.netscape.com/NC-rdf#"

xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#"> <RDF:Seq

RDF:about="urn:root:chapter1"> <RDF:li
RDF:resource="urn:root:chapter1:article1"/> <RDF:li
RDF:resource="urn:root:chapter1:article2"/> </RDF:Seq>

<RDF:Description RDF:about="urn:root"> <Chapters

RDF:resource="urn:root:chapter1"/> <Chapters
RDF:resource="urn:root:chapter2"/> <Chapters
RDF:resource="urn:root:chapter3"/> </RDF:Description> <RDF:Description
RDF:about="urn:root:chapter1:article1"> <Title RDF:resource="title 1"/>
<Author RDF:resource="author 1"/> </RDF:Description>
<RDF:Description RDF:about="urn:root:chapter1:article2"> <Title
RDF:resource="title 2"/> <Author RDF:resource="author 2"/>
</RDF:Description> <RDF:Description
RDF:about="urn:root:chapter2:article1"> <Title RDF:resource="title 3"/>
<Author RDF:resource="author 3"/> </RDF:Description> <RDF:Seq
RDF:about="urn:root:chapter2"> <RDF:li
RDF:resource="urn:root:chapter2:article1"/> </RDF:Seq> </RDF:RDF>

Axel Hecht

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May 1, 2009, 5:22:52 PM5/1/09

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On 01.05.2009 5:56 Uhr, Зажигин Александр wrote:

The target you mark is rdf.GetLiteral("1001"), the target in your DS is
NC:name="10001". Missing '0'.

HTH

Axel

Alexander

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May 1, 2009, 6:14:59 PM5/1/09

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>>
>> It was Marked only here -> "urn:root:chapter1" and I was expecting that
>> it will be removed by Sweep. And also I was expecting that
>> "urn:root:chapter2" container will stay, because this doesn't Mark.
>
> This seems to be the expected output of Sweep.
>
> I slightly modified your data to make the RDF validator happy (default
> namespace), and the arc that you Mark is preserved.
>
> I'll comment on your original post in a sec.
>
> Axel
>
> PS: Data that I looked at on http://www.w3.org/RDF/Validator/ :
>

Mark / Sweep code:

ds.Mark(rdf.GetResource("urn:root"),
rdf.GetResource("urn:mystuff#Chapters"),
rdf.GetResource("urn:root:chapter1"), true);
ds.Sweep();

Output is:

<?xml version="1.0"?>
<RDF:RDF xmlns:NS1="urn:mystuff#"

xmlns:NC="http://home.netscape.com/NC-rdf#"
xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">

<RDF:Description RDF:about="urn:root">

<NS1:Chapters RDF:resource="urn:root:chapter1"/>
</RDF:Description>
</RDF:RDF>

... and this is more less the same and I am still confused. My goal is
to receive something like (everything except removed "urn:root:chapter1"
branch):

<?xml version="1.0"?>
<RDF:RDF xmlns="urn:mystuff#"
xmlns:NC="http://home.netscape.com/NC-rdf#"
xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">

<RDF:Description RDF:about="urn:root">

<RDF:Description RDF:about="urn:root:chapter2:article1">
<Title RDF:resource="title 3"/>
<Author RDF:resource="author 3"/>
</RDF:Description>
<RDF:Seq RDF:about="urn:root:chapter2">
<RDF:li RDF:resource="urn:root:chapter2:article1"/>
</RDF:Seq>
</RDF:RDF>

Sweep removes only Mark branches, am I right?

Alexander.

Axel Hecht

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May 1, 2009, 7:41:18 PM5/1/09

to

Sweep removes anything but marked arcs. RDF doesn't know anything about
subtrees in RDF/XML. If you want to get a particular sub-graph excempt
from sweeping, you need to mark each and every arc in that sub-graph.

Axel

Alexander

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May 2, 2009, 4:11:08 AM5/2/09

to

>> Mark / Sweep code:
>>
>>
>> ds.Mark(rdf.GetResource("urn:root"),
>> rdf.GetResource("urn:mystuff#Chapters"),
>> rdf.GetResource("urn:root:chapter1"), true);
>> ds.Sweep();
>>
>>
>> Output is:
>>
>>
>> <?xml version="1.0"?>
>> <RDF:RDF xmlns:NS1="urn:mystuff#"
>> xmlns:NC="http://home.netscape.com/NC-rdf#"
>> xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
>> <RDF:Description RDF:about="urn:root">
>> <NS1:Chapters RDF:resource="urn:root:chapter1"/>
>> </RDF:Description>
>> </RDF:RDF>
>>
>>
>>
>>

>> Sweep removes only Mark branches, am I right?
>
> Sweep removes anything but marked arcs. RDF doesn't know anything about
> subtrees in RDF/XML. If you want to get a particular sub-graph excempt
> from sweeping, you need to mark each and every arc in that sub-graph.
>

To be able to exclude from sweeping whole "urn:root:chapter1" sub-graph
(see http://zazhigin.ru/testMarkSweep.jpg). I have add follwing to the
script:

ds.Mark(

rdf.GetResource("urn:root:chapter1"),

rdf.GetResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#type"),
rdf.GetResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#Seq"), true);
ds.Mark(

rdf.GetResource("urn:root:chapter1"),

rdf.GetResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#_1"),
rdf.GetResource("urn:root:chapter1:article1"), true);
ds.Mark(

rdf.GetResource("urn:root:chapter1"),

rdf.GetResource("http://www.w3.org/1999/02/22-rdf-syntax-ns#_2"),
rdf.GetResource("urn:root:chapter1:article2"), true);

... and all of these doesn't influence Sweep, the result output is:

<?xml version="1.0"?>
<RDF:RDF xmlns:NS1="urn:mystuff#"
xmlns:NC="http://home.netscape.com/NC-rdf#"
xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#">

<RDF:Description RDF:about="urn:root:chapter1" />

<RDF:Description RDF:about="urn:root">
<NS1:Chapters RDF:resource="urn:root:chapter1"/>
</RDF:Description>
</RDF:RDF>

... I was expecting below code isin:

<RDF:Seq RDF:about="urn:root:chapter1">
<RDF:li RDF:resource="urn:root:chapter1:article1"/>
<RDF:li RDF:resource="urn:root:chapter1:article2"/>
</RDF:Seq>

Alexander.