The import fails with a parser error:
The value of attribute "filter" associated with an element type "faktura-vydana" must not contain the '<' character.
This error doesn't come from ABRA Flexi, but from the XML parser itself — the character < must not appear directly in an attribute value, because in XML it would start a new element.
In XML: entities
In both attributes and element text, characters with special meaning are written as entities:
Character | XML notation |
|
|
|
|
|
|
|
|
The filter in the import XML then looks like this:
<winstrom version="1.0">
<faktura-vydana filter="id < 100">
<popis>hromadná změna</popis>
</faktura-vydana>
</winstrom>
In URLs: percent-encoding
In URLs, entities are not used at all — instead, percent-encoding is used, i.e. %3C instead of < and %20 instead of a space. These are two different mechanisms and should not be confused:
URL: /c/{firma}/faktura-vydana/(datSplat%3Enow()).xml
XML: <faktura-vydana filter="datSplat > now()">
💡 You don't need to do the encoding manually — XML libraries add entities automatically, and most languages have a built-in function for URL encoding. Manually building strings is the most common source of these errors.