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An OSGi bundle for Saxon-HE
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2013 Saxonica Limited.
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.style;

import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.Literal;
import net.sf.saxon.expr.instruct.Executable;
import net.sf.saxon.om.AttributeCollection;
import net.sf.saxon.om.AxisInfo;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.om.StandardNames;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.tree.iter.AxisIterator;
import net.sf.saxon.type.AnyItemType;
import net.sf.saxon.type.ItemType;
import net.sf.saxon.type.TypeHierarchy;


/**
 * An xsl:sequence element in the stylesheet. 

 * The xsl:sequence element takes attributes:
 * a mandatory attribute select="expression".
 * 
 */

public final class XSLSequence extends StyleElement {

    private Expression select;

    /**
    * Determine whether this node is an instruction.
    * @return true - it is an instruction
    */

    public boolean isInstruction() {
        return true;
    }

    /**
     * Determine the type of item returned by this instruction (only relevant if
     * it is an instruction).
     * @return the item type returned
     */

    protected ItemType getReturnedItemType() {
        if (select == null) {
            return AnyItemType.getInstance();
        }
        final TypeHierarchy th = getConfiguration().getTypeHierarchy();
        return select.getItemType(th);
    }

    /**
    * Determine whether this type of element is allowed to contain a sequence constructor
    * @return in XSLT 2.0, false. In XSLT 3.0 true: yes, it may contain a sequence constructor
    */

    public boolean mayContainSequenceConstructor() {
        return isXslt30Processor();
    }

    /**
    * Determine whether this type of element is allowed to contain an xsl:fallback
    * instruction
    */

    public boolean mayContainFallback() {
        return true;
    }

    public void prepareAttributes() throws XPathException {

		String selectAtt = null;

		AttributeCollection atts = getAttributeList();

		for (int a=0; a