Iterating over attributes

[saleyn]

It's unclear from documentation how to iterate over attributes of a given XML node.
I tried the following, without success:

.global.xxx = xml.load_string ("<a value = \"2\" x=\"1\">Hello</a>")
.for xxx. as i
    echo i
.endfor

This prints:

2015/11/13 13:32:55: gsl/4 M: Hello

What I need is an iterator that would iterate through all attributes of "a" node: "value", "x".
Any help?

[hintjens]

I don't think this is possible. Iteration means a list, means elements.

On Fri, Nov 13, 2015 at 7:35 PM, Serge Aleynikov [email protected]
wrote:

It's unclear from documentation how to iterate over attributes of a given
XML node.
I tried the following, without success:

.global.xxx = xml.load_string ("<a value = "2" x="1">Hello")
.for xxx. as i
echo i
.endfor

This prints:

2015/11/13 13:32:55: gsl/4 M: Hello

What I need is an iterator that would iterate through "value", "x".
Any help?

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[saleyn]

So, there is no way for a for/while loop to address the attributes of elements other then to accessing an individual element explicitly by name? Seems like a rather big limitation...

[evoskuil]

Only if you don't control the schema.

[saleyn]

Perhaps I am not thinking in "gsl" way? I have an XML document that I need to use to generate source code that would have a function that returns some node from this XML as an XML string. For that purpose I need to go through the XML doc using selective filtering and output some nodes with conditional filtering of their attributes. I know the schema upfront, but the XML elements have many optional attributes, and some of them need to be filtered out, so I cannot use XML.string() function "as-is". Here's an example:

<protocol app="app1" version="1.0">
    <schema name="secdef" table-group="group1" perm="true" insert="false">
        <deployment>
            <node type="ui"/>
        </deployment>
        <field name="symbol"/>
        <field name="isin"/>
    </schema>
    <schema name="algo" table-group="group2" perm="true" delete="true">
        <deployment>
            <node type="xxx"/>
        </deployment>
        <field name="symbol" key="true"/>
        <field name="isin" visible="false"/>
    </schema>
</protocol>

From this XML I need to produce a string which filters out some attributes, and includes others, e.g.:

<<"<protocol app=\"app1\">
    <schema name=\"secdef\" insert=\"false\">
        <field name=\"symbol\"/>
        <field name=\"isin\"/>
    </schema>
    <schema name=\"algo\" delete=\"true\">
        <field name=\"symbol\" key=\"true\"/>
        <field name=\"isin\"/>
    </schema>
</protocol>">>

Here iterating over children nodes is easy, but iterating over node's attributes and filtering out some of them is the problem I am having trouble with using gsl.