The most common mistakes

1) INVALID URL

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link with diacritics

<URL>http://www.obchod.cz/kuchyňská-linka-charlotte</URL>

link with spaces
<URL>http://www.obchod.cz/kuchynska linka charlotte</URL>

<URL>http://www.obchod.cz/kuchynska-linka-charlotte</URL>

2) SPECIAL CHARACTERS ARE NOT REPLACED BY ENTITIES

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<MANUFACTURER>

           Buday & Sádek

</MANUFACTURER>

Send information in CDATA format:
<MANUFACTURER>
![CDATA[Buday & Sádek]]>
</MANUFACTURER>

or replace characters with matching entities:
<MANUFACTURER>
Buday &amp; Sádek</MANUFACTURER

3) UNCLOSED ELEMENT

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<ITEM_ID>54a6dDT</ITEM_ID>
<PRODUCTNAME>Wooden double bed Merida, 160 x 200 cm

<ITEM_ID>54a6dDT</ITEM_ID>
<PRODUCTNAME>Wooden double bed Merida, 160 x 200 cm</PRODUCTNAME>

 4) IMAGES WITH WATERMARKS OR ADDITIONAL GRAPHICS

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obrazek_bez_vodoznaku

gauc-bez-loga

5) XML FEED IS LOCKED

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Feed reports error 403 Forbidden.

Feed is available for downloading data and allows access from other IP addresses.