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Using (only) negative match keyword in RSS2 Generator

(1 of 8)
Using (only) negative match keyword in RSS2 Generator
May 31, 2012 01:01 PM

Hey all -

 

Running into an "issue" (for me at least) with the RSS2 Generator.

 

Objective: List all the items in a category but exclude certain keywords.

 

Example: List all items in "Collectibles > Breweriana, Beer > Bottles: Glass" (category id 563) but NOT those that have the word "bud*" in them.

 

Example URL: 

http://rest.ebay.com/epn/v1/find/item.rss?keyword=test+-bud*&categoryId1=563&sortOrder=BestMatch&programid=1&campaignid=CAMPAINGIDHERE&toolid=10039&customid=exclude-test&listingType1=All&lgeo=1&feedType=rss

 

I used this a lot with the previous RSS generator to get the newest listings or the most expensive items in a category while excluding a bunch of junk keywords.

 

Any help on getting this working greatly appreciated.

 

TL

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Using (only) negative match keyword in RSS2 Generator

(7 Replies / 355 Views)
Using (only) negative match keyword in RSS2 Generator
May 31, 2012 01:01 PM

Hey all -

 

Running into an "issue" (for me at least) with the RSS2 Generator.

 

Objective: List all the items in a category but exclude certain keywords.

 

Example: List all items in "Collectibles > Breweriana, Beer > Bottles: Glass" (category id 563) but NOT those that have the word "bud*" in them.

 

Example URL: 

http://rest.ebay.com/epn/v1/find/item.rss?keyword=test+-bud*&categoryId1=563&sortOrder=BestMatch&programid=1&campaignid=CAMPAINGIDHERE&toolid=10039&customid=exclude-test&listingType1=All&lgeo=1&feedType=rss

 

I used this a lot with the previous RSS generator to get the newest listings or the most expensive items in a category while excluding a bunch of junk keywords.

 

Any help on getting this working greatly appreciated.

 

TL

Last Post
by clickimusprime (0) View Listings
(2 of 7)
Re: Using (only) negative match keyword in RSS2 Generator
May 31, 2012 01:33 PM

Several things are happening I think that are causing it to fail -

 

1) The new RSS v2 requires at least one keyword - so use bottle or glass

 

2) The using only negative may have worked before the 25th but it looks like they broke the tool then as you get the same error if you use a category that's no longer valid..


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(3 of 7)
Re: Using (only) negative match keyword in RSS2 Generator
May 31, 2012 01:38 PM

1) The new RSS v2 requires at least one keyword - so use bottle or glass

 

Unfortunately there's no keyword or keywords that will give me reliable results without missing a ton of relevant auctions.

 

In fact, for my purposes it'd actually be better to omit auctions that use the two words you suggest (bottle,glass), which puts me right back where I started.

 

TL

 

 

 

(4 of 7)
Re: Using (only) negative match keyword in RSS2 Generator
May 31, 2012 03:58 PM

This limitation doesn't surprise me -- same thing over in the Finding API, upon which RSSv2 is based. Keyword first needed before using a negative keyword.

 

I'm not sure about a solid workaround. But don't forget about lists of positive keywords using wildcards. That works over in Finding, so probably also RSSv2:

 

(glas*,bott*,word3,word4,word5*,etc.) -(negWord1,negWord2)

 



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(5 of 7)
Re: Using (only) negative match keyword in RSS2 Generator
May 31, 2012 08:16 PM

1) The new RSS v2 requires at least one keyword - so use bottle or glass

 

Unfortunately there's no keyword or keywords that will give me reliable results without missing a ton of relevant auctions.

 

In fact, for my purposes it'd actually be better to omit auctions that use the two words you suggest (bottle,glass), which puts me right back where I started.

 

TL

Well considering that the category you are using is 'Bottles : Glass" those would be a good choice.... ?:| Use 'the' instead then.


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(6 of 7)
Re: Using (only) negative match keyword in RSS2 Generator
Jun 1, 2012 07:57 AM

I've found that I can always find a pretty darn good workaround with several + words and several - words. You just have to work...   ...at it a little.

(7 of 7)
Re: Using (only) negative match keyword in RSS2 Generator
Jun 1, 2012 01:41 PM

Another approach is to do a full category only search and filter out the unwanted items after retrieval. Budweiser is a small percentage (under 2%), so this could work well here. For some words, it would result in high exclusion rates.

 

I have a tool for determining best keywords for getting widest range of items from a small category.  Here's a keyword list for 563:

 

non-cumulative frequency table: (matches X in 1000)

bottle: 495
bottles: 146
vintage: 116
brewing: 111
unopened: 109
glass: 88
stout: 86
brewery: 80
stone: 70
dogfish: 65
collectible: 60
empty: 56
limited: 48
barrel: 47
three: 47
black: 45
floyds: 45
adams: 44
bruery: 42

...

budweiser: 33

other bud* variants would be <20 if present.

 

And cumulative title match percentages. Use like this:

bottle* matches 63%

(bottle*,vintage) matches 64.9%

(bottle*,vintage,brewing) matches 68.6%

 

bottle* 0.63

vintage 0.649

brewing 0.686

unopened 0.709

glass 0.731

stout 0.77

brewery 0.789

stone 0.804

dogfish 0.824

collectible 0.826

empty 0.82

limited 0.831

barrel 0.855

three 0.868

black 0.88

floyds 0.881

adams 0.887

bruery 0.905

 

Snapshot based on small sample (1000 items), default sort, not representative of entire category, and may vary with items.

 

 


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